Geolocation: delete GpsLocationProvider and third_party/gpsd/

third_party/gpsd/release-3.1/gps.h

-/* gps.h -- interface of the libgps library */
-/*
- * This file is Copyright (c) 2010 by the GPSD project
- * BSD terms apply: see the file COPYING in the distribution root for details.
- */
-#ifndef _GPSD_GPS_H_
-#define _GPSD_GPS_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Macro for declaring function arguments unused. */
-#if defined(__GNUC__)
-#  define UNUSED __attribute__((unused)) /* Flag variable as unused */
-#else /* not __GNUC__ */
-#  define UNUSED
-#endif
-
-
-#include <sys/types.h>
-#include <sys/time.h>
-#include <stdbool.h>
-#include <inttypes.h>   /* stdint.h would be smaller but not all have it */
-#include <limits.h>
-#include <time.h>
-#include <signal.h>
-#include <stdio.h>
-#ifndef S_SPLINT_S
-#include <pthread.h>    /* pacifies OpenBSD's compiler */
-#endif
-
-/*
- * 4.1 - Base version for initial JSON protocol (Dec 2009, release 2.90)
- * 4.2 - AIS application IDs split into DAC and FID (July 2010, release 2.95)
- * 5.0 - MAXCHANNELS bumped from 20 to 32 for GLONASS (Mar 2011, release 2.96)
- *       gps_open() becomes reentrant, what gps_open_r() used to be. 
- *       gps_poll() removed in favor of gps_read().  The raw hook is gone.
- */
-#define GPSD_API_MAJOR_VERSION  5       /* bump on incompatible changes */
-#define GPSD_API_MINOR_VERSION  0       /* bump on compatible changes */
-
-#define MAXTAGLEN       8       /* maximum length of sentence tag name */
-#define MAXCHANNELS     72      /* must be > 12 GPS + 12 GLONASS + 2 WAAS */
-#define GPS_PRNMAX      32      /* above this number are SBAS satellites */
-#define GPS_PATH_MAX    64      /* dev files usually have short names */
-#define MAXUSERDEVS     4       /* max devices per user */
-
-/* 
- * The structure describing an uncertainty volume in kinematic space.
- * This is what GPSes are meant to produce; all the other info is 
- * technical impedimenta.
- *
- * All double values use NAN to indicate data not available.
- *
- * Usually all the information in this structure was considered valid
- * by the GPS at the time of update.  This will be so if you are using
- * a GPS chipset that speaks SiRF binary, Garmin binary, or Zodiac binary.
- * This covers over 80% of GPS products in early 2005.
- *
- * If you are using a chipset that speaks NMEA, this structure is updated
- * in bits by GPRMC (lat/lon, track, speed), GPGGA (alt, climb), GPGLL 
- * (lat/lon), and GPGSA (eph, epv).  Most NMEA GPSes take a single fix
- * at the beginning of a 1-second cycle and report the same timestamp in
- * GPRMC, GPGGA, and GPGLL; for these, all info is guaranteed correctly
- * synced to the time member, but you'll get different stages of the same 
- * update depending on where in the cycle you poll.  A very few GPSes, 
- * like the Garmin 48, take a new fix before more than one of of 
- * GPRMC/GPGGA/GPGLL during a single cycle; thus, they may have different 
- * timestamps and some data in this structure can be up to 1 cycle (usually
- * 1 second) older than the fix time.
- *
- * Error estimates are at 95% confidence.
- */
-typedef double timestamp_t;     /* Unix time in seconds with fractional part */
-
-struct gps_fix_t {
-    timestamp_t time;   /* Time of update */
-    int    mode;        /* Mode of fix */
-#define MODE_NOT_SEEN   0       /* mode update not seen yet */
-#define MODE_NO_FIX     1       /* none */
-#define MODE_2D         2       /* good for latitude/longitude */
-#define MODE_3D         3       /* good for altitude/climb too */
-    double ept;         /* Expected time uncertainty */
-    double latitude;    /* Latitude in degrees (valid if mode >= 2) */
-    double epy;         /* Latitude position uncertainty, meters */
-    double longitude;   /* Longitude in degrees (valid if mode >= 2) */
-    double epx;         /* Longitude position uncertainty, meters */
-    double altitude;    /* Altitude in meters (valid if mode == 3) */
-    double epv;         /* Vertical position uncertainty, meters */
-    double track;       /* Course made good (relative to true north) */
-    double epd;         /* Track uncertainty, degrees */
-    double speed;       /* Speed over ground, meters/sec */
-    double eps;         /* Speed uncertainty, meters/sec */
-    double climb;       /* Vertical speed, meters/sec */
-    double epc;         /* Vertical speed uncertainty */
-};
-
-/* 
- * The structure describing the pseudorange errors (GPGST)
- */
-struct gst_t {
-    double utctime;
-    double rms_deviation;
-    double smajor_deviation;
-    double sminor_deviation;
-    double smajor_orientation;
-    double lat_err_deviation;
-    double lon_err_deviation;
-    double alt_err_deviation;
-};
-
-/*  
- * From the RCTM104 2.x standard:
- *
- * "The 30 bit words (as opposed to 32 bit words) coupled with a 50 Hz
- * transmission rate provides a convenient timing capability where the
- * times of word boundaries are a rational multiple of 0.6 seconds."
- *
- * "Each frame is N+2 words long, where N is the number of message data
- * words. For example, a filler message (type 6 or 34) with no message
- * data will have N=0, and will consist only of two header words. The
- * maximum number of data words allowed by the format is 31, so that
- * the longest possible message will have a total of 33 words."
- */
-#define RTCM2_WORDS_MAX 33
-#define MAXCORRECTIONS  18      /* max correction count in type 1 or 9 */
-#define MAXSTATIONS     10      /* maximum stations in almanac, type 5 */
-/* RTCM104 doesn't specify this, so give it the largest reasonable value */
-#define MAXHEALTH       (RTCM2_WORDS_MAX-2)
-
-#ifndef S_SPLINT_S 
-/*
- * A nominally 30-bit word (24 bits of data, 6 bits of parity)
- * used both in the GPS downlink protocol described in IS-GPS-200
- * and in the format for DGPS corrections used in RTCM-104v2.
- */
-typedef /*@unsignedintegraltype@*/ uint32_t isgps30bits_t;
-#endif /* S_SPLINT_S */
-
-/* 
- * Values for "system" fields.  Note, the encoding logic is senstive to the 
- * actual values of these; it's not sufficient that they're distinct.
- */
-#define NAVSYSTEM_GPS           0
-#define NAVSYSTEM_GLONASS       1
-#define NAVSYSTEM_GALILEO       2
-#define NAVSYSTEM_UNKNOWN       3
-
-struct rtcm2_t {
-    /* header contents */
-    unsigned type;      /* RTCM message type */
-    unsigned length;    /* length (words) */
-    double   zcount;    /* time within hour: GPS time, no leap secs */
-    unsigned refstaid;  /* reference station ID */
-    unsigned seqnum;    /* message sequence number (modulo 8) */
-    unsigned stathlth;  /* station health */
-
-    /* message data in decoded form */
-    union {
-        struct {
-            unsigned int nentries;
-            struct gps_rangesat_t {     /* data from messages 1 & 9 */
-                unsigned ident;         /* satellite ID */
-                unsigned udre;          /* user diff. range error */
-                unsigned iod;           /* issue of data */
-                double prc;             /* range error */
-                double rrc;             /* range error rate */
-            } sat[MAXCORRECTIONS];
-        } gps_ranges;
-        struct {                /* data for type 3 messages */
-            bool valid;         /* is message well-formed? */
-            double x, y, z;
-        } ecef;
-        struct {                /* data from type 4 messages */
-            bool valid;         /* is message well-formed? */
-            int system;
-            int sense;
-#define SENSE_INVALID   0
-#define SENSE_GLOBAL    1
-#define SENSE_LOCAL     2
-            char datum[6];
-            double dx, dy, dz;
-        } reference;
-        struct {                /* data from type 5 messages */
-            unsigned int nentries;
-            struct consat_t {
-                unsigned ident;         /* satellite ID */
-                bool iodl;              /* issue of data */
-                unsigned int health;    /* is satellite healthy? */
-#define HEALTH_NORMAL           (0)     /* Radiobeacon operation normal */
-#define HEALTH_UNMONITORED      (1)     /* No integrity monitor operating */
-#define HEALTH_NOINFO           (2)     /* No information available */
-#define HEALTH_DONOTUSE         (3)     /* Do not use this radiobeacon */
-               int snr;                 /* signal-to-noise ratio, dB */
-#define SNR_BAD -1                      /* not reported */
-                bool health_en;         /* health enabled */
-                bool new_data;          /* new data? */
-                bool los_warning;       /* line-of-sight warning */
-                unsigned int tou;       /* time to unhealth, seconds */
-            } sat[MAXHEALTH];
-        } conhealth;
-        struct {                /* data from type 7 messages */
-            unsigned int nentries;
-            struct station_t {
-                double latitude, longitude;     /* location */
-                unsigned int range;             /* range in km */
-                double frequency;               /* broadcast freq */
-                unsigned int health;            /* station health */
-                unsigned int station_id;        /* of the transmitter */
-                unsigned int bitrate;           /* of station transmissions */
-            } station[MAXSTATIONS];
-        } almanac;
-        struct {                /* data for type 13 messages */
-            bool status;                /* expect a text message */
-            bool rangeflag;             /* station range altered? */
-            double lat, lon;            /* station longitude/latitude */
-            unsigned int range;         /* transmission range in km */
-        } xmitter;
-        struct {                /* data from type 14 messages */
-            unsigned int week;                  /* GPS week (0-1023) */
-            unsigned int hour;                  /* Hour in week (0-167) */
-            unsigned int leapsecs;              /* Leap seconds (0-63) */
-        } gpstime;
-        struct {
-            unsigned int nentries;
-            struct glonass_rangesat_t {         /* data from message type 31 */
-                unsigned ident;         /* satellite ID */
-                unsigned udre;          /* user diff. range error */
-                unsigned tod;           /* issue of data */
-                bool change;            /* ephemeris change bit */
-                double prc;             /* range error */
-                double rrc;             /* range error rate */
-            } sat[MAXCORRECTIONS];
-        } glonass_ranges;
-        /* data from type 16 messages */
-        char message[(RTCM2_WORDS_MAX-2) * sizeof(isgps30bits_t)];
-        /* data from messages of unknown type */
-        isgps30bits_t   words[RTCM2_WORDS_MAX-2];
-    };
-};
-
-/* RTCM3 report structures begin here */
-
-#define RTCM3_MAX_SATELLITES    64
-#define RTCM3_MAX_DESCRIPTOR    31
-#define RTCM3_MAX_ANNOUNCEMENTS 32
-
-struct rtcm3_rtk_hdr {          /* header data from 1001, 1002, 1003, 1004 */
-    /* Used for both GPS and GLONASS, but their timebases differ */
-    unsigned int station_id;    /* Reference Station ID */
-    time_t tow;                 /* GPS Epoch Time (TOW) in ms, 
-                                   or GLONASS Epoch Time in ms */
-    bool sync;                  /* Synchronous GNSS Message Flag */
-    unsigned short satcount;    /* # Satellite Signals Processed */
-    bool smoothing;             /* Divergence-free Smoothing Indicator */
-    unsigned short interval;    /* Smoothing Interval */
-};
-
-struct rtcm3_basic_rtk {
-    unsigned char indicator;    /* Indicator */
-    short channel;              /* Satellite Frequency Channel Number 
-                                   (GLONASS only) */
-    double pseudorange;         /* Pseudorange */
-    double rangediff;           /* PhaseRange – Pseudorange in meters */
-    unsigned char locktime;     /* Lock time Indicator */
-};
-
-struct rtcm3_extended_rtk {
-    unsigned char indicator;    /* Indicator */
-    short channel;              /* Satellite Frequency Channel Number 
-                                   (GLONASS only) */
-    double pseudorange;         /* Pseudorange */
-    double rangediff;           /* PhaseRange – L1 Pseudorange */
-    unsigned char locktime;     /* Lock time Indicator */
-    unsigned char ambiguity;    /* Integer Pseudorange 
-                                           Modulus Ambiguity */
-    double CNR;                 /* Carrier-to-Noise Ratio */
-};
-
-struct rtcm3_network_rtk_header {
-    unsigned int network_id;    /* Network ID */
-    unsigned int subnetwork_id; /* Subnetwork ID */
-    time_t time;                /* GPS Epoch Time (TOW) in ms */
-    bool multimesg;             /* GPS Multiple Message Indicator */
-    unsigned master_id;         /* Master Reference Station ID */
-    unsigned aux_id;            /* Auxilary Reference Station ID */
-    unsigned char satcount;     /* count of GPS satellites */
-};
-
-struct rtcm3_correction_diff {
-    unsigned char ident;        /* satellite ID */
-    enum {reserved, correct, widelane, uncertain} ambiguity;
-    unsigned char nonsync;
-    double geometric_diff;      /* Geometric Carrier Phase 
-                                   Correction Difference (1016, 1017) */
-    unsigned char iode;         /* GPS IODE (1016, 1017) */
-    double ionospheric_diff;    /* Ionospheric Carrier Phase 
-                                   Correction Difference (1015, 1017) */
-};
-
-struct rtcm3_t {
-    /* header contents */
-    unsigned type;      /* RTCM 3.x message type */
-    unsigned length;    /* payload length, inclusive of checksum */
-
-    union {
-        /* 1001-1013 were present in the 3.0 version */
-        struct {
-            struct rtcm3_rtk_hdr        header;
-            struct rtcm3_1001_t {
-                unsigned ident;                 /* Satellite ID */
-                struct rtcm3_basic_rtk L1;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1001;
-        struct rtcm3_1002_t {
-            struct rtcm3_rtk_hdr        header;
-            struct {
-                unsigned ident;                 /* Satellite ID */
-                struct rtcm3_extended_rtk L1;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1002;
-        struct rtcm3_1003_t {
-            struct rtcm3_rtk_hdr        header;
-            struct {
-                unsigned ident;                 /* Satellite ID */
-                struct rtcm3_basic_rtk L1;
-                struct rtcm3_basic_rtk L2;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1003;
-        struct rtcm3_1004_t {
-            struct rtcm3_rtk_hdr        header;
-            struct {
-                unsigned ident;                 /* Satellite ID */
-                struct rtcm3_extended_rtk L1;
-                struct rtcm3_extended_rtk L2;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1004;
-        struct rtcm3_1005_t {
-            unsigned int station_id;            /* Reference Station ID */
-            int system;                         /* Which system is it? */
-            bool reference_station;             /* Reference-station indicator */
-            bool single_receiver;               /* Single Receiver Oscillator */
-            double ecef_x, ecef_y, ecef_z;      /* ECEF antenna location */
-        } rtcm3_1005;
-        struct rtcm3_1006_t {
-            unsigned int station_id;            /* Reference Station ID */
-            int system;                         /* Which system is it? */
-            bool reference_station;             /* Reference-station indicator */
-            bool single_receiver;               /* Single Receiver Oscillator */
-            double ecef_x, ecef_y, ecef_z;      /* ECEF antenna location */
-            double height;                      /* Antenna height */
-        } rtcm3_1006;
-        struct rtcm3_1007_t {
-            unsigned int station_id;                    /* Reference Station ID */
-            char descriptor[RTCM3_MAX_DESCRIPTOR+1];    /* Description string */
-            unsigned char setup_id;
-        } rtcm3_1007;
-        struct rtcm3_1008_t {
-            unsigned int station_id;                    /* Reference Station ID */
-            char descriptor[RTCM3_MAX_DESCRIPTOR+1];    /* Description string */
-            unsigned char setup_id;
-            char serial[RTCM3_MAX_DESCRIPTOR+1];        /* Serial # string */
-        } rtcm3_1008;
-        struct rtcm3_1009_t {
-            struct rtcm3_rtk_hdr        header;
-            struct {
-                unsigned ident;         /* Satellite ID */
-                struct rtcm3_basic_rtk L1;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1009;
-        struct rtcm3_1010_t {
-            struct rtcm3_rtk_hdr        header;
-            struct {
-                unsigned ident;         /* Satellite ID */
-                struct rtcm3_extended_rtk L1;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1010;
-        struct rtcm3_1011_t {
-            struct rtcm3_rtk_hdr        header;
-            struct {
-                unsigned ident;                 /* Satellite ID */
-                struct rtcm3_extended_rtk L1;
-                struct rtcm3_extended_rtk L2;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1011;
-        struct rtcm3_1012_t {
-            struct rtcm3_rtk_hdr        header;
-            struct {
-                unsigned ident;                 /* Satellite ID */
-                struct rtcm3_extended_rtk L1;
-                struct rtcm3_extended_rtk L2;
-            } rtk_data[RTCM3_MAX_SATELLITES];
-        } rtcm3_1012;
-        struct rtcm3_1013_t {
-            unsigned int station_id;    /* Reference Station ID */
-            unsigned short mjd;         /* Modified Julian Day (MJD) Number */
-            unsigned int sod;           /* Seconds of Day (UTC) */
-            unsigned char leapsecs;     /* Leap Seconds, GPS-UTC */
-            unsigned char ncount;       /* Count of announcements to follow */
-            struct {
-                unsigned short id;              /* message type ID */
-                bool sync;
-                unsigned short interval;        /* interval in 0.1sec units */
-            } announcements[RTCM3_MAX_ANNOUNCEMENTS];
-        } rtcm3_1013;
-        /* 1014-1017 were added in the 3.1 version */
-        struct rtcm3_1014_t {
-            unsigned int network_id;    /* Network ID */
-            unsigned int subnetwork_id; /* Subnetwork ID */
-            unsigned char stationcount; /* # auxiliary stations transmitted */
-            unsigned int master_id;     /* Master Reference Station ID */
-            unsigned int aux_id;        /* Auxilary Reference Station ID */
-            double d_lat, d_lon, d_alt; /* Aux-master location delta */
-        } rtcm3_1014;
-        struct rtcm3_1015_t {
-            struct rtcm3_network_rtk_header     header;
-            struct rtcm3_correction_diff corrections[RTCM3_MAX_SATELLITES];
-        } rtcm3_1015;
-        struct rtcm3_1016_t {
-            struct rtcm3_network_rtk_header     header;
-            struct rtcm3_correction_diff corrections[RTCM3_MAX_SATELLITES];
-        } rtcm3_1016;
-        struct rtcm3_1017_t {
-            struct rtcm3_network_rtk_header     header;
-            struct rtcm3_correction_diff corrections[RTCM3_MAX_SATELLITES];
-        } rtcm3_1017;
-        /* 1018-1029 were in the 3.0 version */
-        struct rtcm3_1019_t {
-            unsigned int ident;         /* Satellite ID */
-            unsigned int week;          /* GPS Week Number */
-            unsigned char sv_accuracy;  /* GPS SV ACCURACY */
-            enum {reserved_code, p, ca, l2c} code;
-            double idot;
-            unsigned char iode;
-            /* ephemeris fields, not scaled */
-            unsigned int t_sub_oc;
-            signed int a_sub_f2;
-            signed int a_sub_f1;
-            signed int a_sub_f0;
-            unsigned int iodc;
-            signed int C_sub_rs;
-            signed int delta_sub_n;
-            signed int M_sub_0;
-            signed int C_sub_uc;
-            unsigned int e;
-            signed int C_sub_us;
-            unsigned int sqrt_sub_A;
-            unsigned int t_sub_oe;
-            signed int C_sub_ic;
-            signed int OMEGA_sub_0;
-            signed int C_sub_is;
-            signed int i_sub_0;
-            signed int C_sub_rc;
-            signed int argument_of_perigee;
-            signed int omegadot;
-            signed int t_sub_GD;
-            unsigned char sv_health;
-            bool p_data;
-            bool fit_interval;
-        } rtcm3_1019;
-        struct rtcm3_1020_t {
-            unsigned int ident;         /* Satellite ID */
-            unsigned short channel;     /* Satellite Frequency Channel Number */
-            /* ephemeris fields, not scaled */
-            bool C_sub_n;
-            bool health_avAilability_indicator;
-            unsigned char P1;
-            unsigned short t_sub_k;
-            bool msb_of_B_sub_n;
-            bool P2;
-            bool t_sub_b;
-            signed int x_sub_n_t_of_t_sub_b_prime;
-            signed int x_sub_n_t_of_t_sub_b;
-            signed int x_sub_n_t_of_t_sub_b_prime_prime;
-            signed int y_sub_n_t_of_t_sub_b_prime;
-            signed int y_sub_n_t_of_t_sub_b;
-            signed int y_sub_n_t_of_t_sub_b_prime_prime;
-            signed int z_sub_n_t_of_t_sub_b_prime;
-            signed int z_sub_n_t_of_t_sub_b;
-            signed int z_sub_n_t_of_t_sub_b_prime_prime;
-            bool P3;
-            signed int gamma_sub_n_of_t_sub_b;
-            unsigned char MP;
-            bool Ml_n;
-            signed int tau_n_of_t_sub_b;
-            signed int M_delta_tau_sub_n;
-            unsigned int E_sub_n;
-            bool MP4;
-            unsigned char MF_sub_T;
-            unsigned char MN_sub_T;
-            unsigned char MM;
-            bool additioinal_data_availability;
-            unsigned int N_sup_A;
-            unsigned int tau_sub_c;
-            unsigned int M_N_sub_4;
-            signed int M_tau_sub_GPS;
-            bool M_l_sub_n;
-        } rtcm3_1020;
-        struct rtcm3_1029_t {
-            unsigned int station_id;    /* Reference Station ID */
-            unsigned short mjd;         /* Modified Julian Day (MJD) Number */
-            unsigned int sod;           /* Seconds of Day (UTC) */
-            size_t len;                 /* # chars to follow */
-            size_t unicode_units;       /* # Unicode units in text */
-            unsigned char text[128];
-        } rtcm3_1029;
-        struct rtcm3_1033_t {
-            unsigned int station_id;                    /* Reference Station ID */
-            char descriptor[RTCM3_MAX_DESCRIPTOR+1];    /* Description string */
-            unsigned char setup_id;
-            char serial[RTCM3_MAX_DESCRIPTOR+1];        /* Serial # string */
-            char receiver[RTCM3_MAX_DESCRIPTOR+1];      /* Receiver string */
-            char firmware[RTCM3_MAX_DESCRIPTOR+1];      /* Firmware string */
-        } rtcm3_1033;
-        char data[1024];                /* Max RTCM3 msg length is 1023 bytes */
-    } rtcmtypes;
-};
-
-/* RTCM3 scaling constants */
-#define GPS_AMBIGUITY_MODULUS           299792.458      /* 1004, DF014*/
-#define GLONASS_AMBIGUITY_MODULUS       599584.916      /* 1012, DF044 */
-#define MESSAGE_INTERVAL_UNITS          0.1             /* 1013, DF047 */
-
-/*
- * Raw IS_GPS subframe data
- */
-
-/* The almanac is a subset of the clock and ephemeris data, with reduced 
- * precision. See IS-GPS-200E, Table 20-VI  */
-struct almanac_t
-{
-    uint8_t sv;  /* The satellite this refers to */
-    /* toa, almanac reference time, 8 bits unsigned, seconds */
-    uint8_t toa;
-    long l_toa;
-    /* SV health data, 8 bit unsigned bit map */
-    uint8_t svh;
-    /* deltai, correction to inclination, 16 bits signed, semi-circles */
-    int16_t deltai;
-    double d_deltai;
-    /* M0, Mean Anomaly at Reference Time, 24 bits signed, semi-circles */
-    int32_t M0;
-    double d_M0;
-    /* Omega0, Longitude of Ascending Node of Orbit Plane at Weekly Epoch,
-     * 24 bits signed, semi-circles */
-    int32_t Omega0;
-    double d_Omega0;
-    /* omega, Argument of Perigee, 24 bits signed, semi-circles */
-    int32_t omega;
-    double d_omega;
-    /* af0, SV clock correction constant term
-     * 11 bits signed, seconds */
-    int16_t af0;
-    double d_af0;
-    /* af1, SV clock correction first order term
-     * 11 bits signed, seconds/second */
-    int16_t af1;
-    double d_af1;
-    /* eccentricity, 16 bits, unsigned, dimensionless */
-    uint16_t e;
-    double d_eccentricity;
-    /* sqrt A, Square Root of the Semi-Major Axis
-     * 24 bits unsigned, square_root(meters) */
-    uint32_t sqrtA;
-    double d_sqrtA;
-    /* Omega dot, Rate of Right Ascension, 16 bits signed, semi-circles/sec */
-    int16_t Omegad;
-    double d_Omegad;
-};
-
-struct subframe_t {
-    /* subframe number, 3 bits, unsigned, 1 to 5 */
-    uint8_t subframe_num;
-    /* data_id, denotes the NAV data structure of D(t), 2 bits, in
-     * IS-GPS-200E always == 0x1 */
-    uint8_t data_id;
-    /* SV/page id used for subframes 4 & 5, 6 bits */
-    uint8_t pageid; 
-    /* tSVID, SV ID of the sat that transmitted this frame, 6 bits unsigned */
-    uint8_t tSVID;
-    /* TOW, Time of Week of NEXT message, 17 bits unsigned, scale 6, seconds */
-    uint32_t TOW17;
-    long l_TOW17;
-    /* integrity, URA bounds flag, 1 bit */
-    bool integrity;
-    /* alert, alert flag, SV URA and/or the SV User Differential Range 
-     * Accuracy (UDRA) may be worse than indicated, 1 bit */
-    bool alert;
-    /* antispoof, A-S mode is ON in that SV, 1 bit */
-    bool antispoof;
-    int is_almanac;
-    union {
-        /* subframe 1, part of ephemeris, see IS-GPS-200E, Table 20-II
-         * and Table 20-I */
-        struct {
-            /* WN, Week Number, 10 bits unsigned, scale 1, weeks */
-            uint16_t WN;
-            /* IODC, Issue of Data, Clock, 10 bits, unsigned, 
-             * issued in 8 data ranges at the same time */
-            uint16_t IODC;
-            /* toc, clock data reference time, 16 bits, unsigned, seconds
-             * scale 2**4, issued in 8 data ranges at the same time */
-            uint16_t toc;
-            long l_toc;
-            /* l2, code on L2, 2 bits, bit map */
-            uint8_t l2;
-            /* l2p, L2 P data flag, 1 bit */
-            uint8_t l2p;
-            /* ura, SV accuracy, 4 bits unsigned index */
-            unsigned int ura;
-            /* hlth, SV health, 6 bits unsigned bitmap */
-            unsigned int hlth;
-            /* af0, SV clock correction constant term
-             * 22 bits signed, scale 2**-31, seconds */
-            int32_t af0;
-            double d_af0;
-            /* af1, SV clock correction first order term
-             * 22 bits signed, scale 2**-43, seconds/second */
-            int16_t af1;
-            double d_af1;
-            /* af2, SV clock correction second order term
-             * 8 bits signed, scale 2**-55, seconds/second**2 */
-            int8_t af2;
-            double d_af2;
-            /* Tgd,  L1-L2 correction term, 8 bits signed,  scale 2**-31,
-             * seconds */
-            int8_t Tgd;
-            double d_Tgd;
-        } sub1;
-        /* subframe 2, part of ephemeris, see IS-GPS-200E, Table 20-II
-         * and Table 20-III */
-        struct {
-            /* Issue of Data (Ephemeris), 
-             * equal to the 8 LSBs of the 10 bit IODC of the same data set */
-            uint8_t IODE;
-            /* Age of Data Offset for the NMCT, 6 bits, scale 900,
-             * ignore if all ones, seconds */
-            uint8_t AODO;
-            uint16_t u_AODO;
-            /* fit, FIT interval flag, indicates a fit interval greater than
-             * 4 hour, 1 bit */
-            uint8_t fit;
-            /* toe, Reference Time Ephemeris, 16 bits unsigned, scale 2**4,
-             * seconds */
-            uint16_t toe;
-            long l_toe;
-            /* Crs, Amplitude of the Sine Harmonic Correction Term to the 
-             * Orbit Radius, 16 bits, scale 2**-5, signed, meters */
-            int16_t Crs;
-            double d_Crs;
-            /* Cus, Amplitude of the Sine Harmonic Correction Term to the 
-             * Argument of Latitude, 16 bits, signed, scale 2**-29, radians */
-            int16_t Cus;
-            double d_Cus;
-            /* Cuc, Amplitude of the Cosine Harmonic Correction Term to the 
-             * Argument of Latitude, 16 bits, signed, scale 2**-29, radians */
-            int16_t Cuc;
-            double d_Cuc;
-            /* deltan, Mean Motion Difference From Computed Value
-             * Mean Motion Difference From Computed Value
-             * 16 bits, signed, scale 2**-43, semi-circles/sec */
-            int16_t deltan;
-            double d_deltan;
-            /* M0, Mean Anomaly at Reference Time, 32 bits signed, 
-             * scale 2**-31, semi-circles */
-            int32_t M0;
-            double d_M0;
-            /* eccentricity, 32 bits, unsigned, scale 2**-33, dimensionless */
-            uint32_t e;
-            double d_eccentricity;
-            /* sqrt A, Square Root of the Semi-Major Axis
-             * 32 bits unsigned, scale 2**-19, square_root(meters) */
-            uint32_t sqrtA;
-            double d_sqrtA;
-        } sub2;
-        /* subframe 3, part of ephemeris, see IS-GPS-200E, Table 20-II,
-         * Table 20-III */
-        struct {
-            /* Issue of Data (Ephemeris), 8 bits, unsigned 
-             * equal to the 8 LSBs of the 10 bit IODC of the same data set */
-            uint8_t IODE;
-            /* Rate of Inclination Angle, 14 bits signed, scale2**-43,
-             * semi-circles/sec */
-            uint16_t IDOT;
-            double d_IDOT;
-            /* Cic, Amplitude of the Cosine Harmonic Correction Term to the 
-             * Angle of Inclination, 16 bits signed, scale 2**-29, radians*/
-            uint16_t Cic;
-            double d_Cic;
-            /* Cis, Amplitude of the Sine Harmonic Correction Term to the
-             * Angle of Inclination, 16 bits, unsigned, scale 2**-29, radians */
-            int16_t Cis;
-            double d_Cis;
-            /* Crc, Amplitude of the Cosine Harmonic Correction Term to the
-             * Orbit Radius, 16 bits signed, scale 2**-5, meters */
-            int16_t Crc;
-            double d_Crc;
-            /* i0, Inclination Angle at Reference Time, 32 bits, signed,
-             * scale 2**-31, semi-circles */
-            int32_t i0;
-            double d_i0;
-            /* Omega0, Longitude of Ascending Node of Orbit Plane at Weekly 
-             * Epoch, 32 bits signed, semi-circles */
-            int32_t Omega0;
-            double d_Omega0;
-            /* omega, Argument of Perigee, 32 bits signed, scale 2**-31,
-             * semi-circles */
-            int32_t omega;
-            double d_omega;
-            /* Omega dot, Rate of Right Ascension, 24 bits signed, 
-             * scale 2**-43, semi-circles/sec */
-            int32_t Omegad;
-            double d_Omegad;
-        } sub3;
-        struct {
-            struct almanac_t almanac;
-        } sub4;
-        /* subframe 4, page 13 */
-        struct {
-            /* mapping ord ERD# to SV # is non trivial
-             * leave it alone.  See IS-GPS-200E Section 20.3.3.5.1.9 */
-            /* Estimated Range Deviation, 6 bits signed, meters */
-            char ERD[33];
-            /* ai, Availability Indicator, 2bits, bit map */
-            unsigned char ai;
-        } sub4_13;
-        /* subframe 4, page 17, system message, 23 chars, plus nul */
-        struct {
-            char str[24];
-        } sub4_17;
-        /* subframe 4, page 18 */
-        struct {
-            /* ionospheric and UTC data */
-            /* A0, Bias coefficient of GPS time scale relative to UTC time 
-             * scale, 32 bits signed, scale 2**-30, seconds */
-            int32_t A0;
-            double d_A0;
-            /* A1, Drift coefficient of GPS time scale relative to UTC time 
-             * scale, 24 bits signed, scale 2**-50, seconds/second */
-            int32_t A1;
-            double d_A1;
-
-            /* alphaX, the four coefficients of a cubic equation representing 
-             * the amplitude of the vertical delay */
-
-            /* alpha0, 8 bits signed, scale w**-30, seconds */
-            int8_t alpha0;
-            double d_alpha0;
-            /* alpha1, 8 bits signed, scale w**-27, seconds/semi-circle */
-            int8_t alpha1;
-            double d_alpha1;
-            /* alpha2, 8 bits signed, scale w**-24, seconds/semi-circle**2 */
-            int8_t alpha2;
-            double d_alpha2;
-            /* alpha3, 8 bits signed, scale w**-24, seconds/semi-circle**3 */
-            int8_t alpha3;
-            double d_alpha3;
-
-            /* betaX, the four coefficients of a cubic equation representing 
-             * the period of the model */
-
-            /* beta0, 8 bits signed, scale w**11, seconds */
-            int8_t beta0;
-            double d_beta0;
-            /* beta1, 8 bits signed, scale w**14, seconds/semi-circle */
-            int8_t beta1;
-            double d_beta1;
-            /* beta2, 8 bits signed, scale w**16, seconds/semi-circle**2 */
-            int8_t beta2;
-            double d_beta2;
-            /* beta3, 8 bits signed, scale w**16, seconds/semi-circle**3 */
-            int8_t beta3;
-            double d_beta3;
-            
-            /* leap (delta t ls), current leap second, 8 bits signed, 
-             * scale 1, seconds */
-            int8_t leap;
-            /* lsf (delta t lsf), future leap second, 8 bits signed, 
-             * scale 1, seconds */
-            int8_t lsf;
-
-            /* tot, reference time for UTC data,
-             * 8 bits unsigned, scale 2**12, seconds */
-            uint8_t tot;
-            double d_tot;
-
-            /* WNt, UTC reference week number, 8 bits unsigned, scale 1, 
-             * weeks */
-            uint8_t WNt;
-            /* WNlsf, Leap second reference Week Number,
-             * 8 bits unsigned, scale 1, weeks */
-            uint8_t WNlsf;
-            /* DN, Leap second reference Day Number , 8 bits unsigned,
-             * scale 1, days */
-            uint8_t DN;
-        } sub4_18;
-        /* subframe 4, page 25 */
-        struct {
-            /* svf, A-S status and the configuration code of each SV
-             * 4 bits unsigned, bitmap */
-            unsigned char svf[33];
-            /* svh, SV health data for SV 25 through 32
-             * 6 bits unsigned bitmap */
-            uint8_t svhx[8];
-        } sub4_25;
-        struct {
-            struct almanac_t almanac;
-        } sub5;
-        struct {
-            /* toa, Almanac reference Time, 8 bits unsigned, scale 2**12,
-             * seconds */
-            uint8_t toa;
-            long l_toa;
-            /* WNa, Week Number almanac, 8 bits, scale 2, GPS Week 
-             * Number % 256 */
-            uint8_t WNa;
-            /* sv, SV health status, 6 bits, bitmap */
-            uint8_t sv[25];
-        } sub5_25;
-    };
-};
-
-#ifndef S_SPLINT_S
-typedef uint64_t gps_mask_t;
-#else
-typedef /*@unsignedintegraltype@*/ unsigned long long gps_mask_t;
-#endif /* S_SPLINT_S */
-
-/* 
- * Is an MMSI number that of an auxiliary associated with a mother ship?
- * We need to be able to test this for decoding AIS Type 24 messages.
- * According to <http://www.navcen.uscg.gov/marcomms/gmdss/mmsi.htm#format>,
- * auxiliary-craft MMSIs have the form 98MIDXXXX, where MID is a country 
- * code and XXXX the vessel ID.
- */
-#define AIS_AUXILIARY_MMSI(n)   ((n) / 10000000 == 98)
-
-/* N/A values and scaling constant for 25/24 bit lon/lat pairs */
-#define AIS_LON3_NOT_AVAILABLE  181000
-#define AIS_LAT3_NOT_AVAILABLE  91000
-#define AIS_LATLON3_SCALE       60000.0
-
-/* N/A values and scaling constant for 28/27 bit lon/lat pairs */
-#define AIS_LON4_NOT_AVAILABLE  1810000
-#define AIS_LAT4_NOT_AVAILABLE  910000
-#define AIS_LATLON4_SCALE       600000.0
-
-struct route_info {
-    unsigned int linkage;       /* Message Linkage ID */
-    unsigned int sender;        /* Sender Class */
-    unsigned int rtype;         /* Route Type */
-    unsigned int month;         /* Start month */
-    unsigned int day;           /* Start day */
-    unsigned int hour;          /* Start hour */
-    unsigned int minute;        /* Start minute */
-    unsigned int duration;      /* Duration */
-    int waycount;               /* Waypoint count */
-    struct waypoint_t {
-        signed int lon;         /* Longitude */
-        signed int lat;         /* Latitude */
-    } waypoints[16];
-};
-
-struct ais_t
-{
-    unsigned int        type;           /* message type */
-    unsigned int        repeat;         /* Repeat indicator */
-    unsigned int        mmsi;           /* MMSI */
-    union {
-        /* Types 1-3 Common navigation info */
-        struct {
-            unsigned int status;                /* navigation status */
-            signed turn;                        /* rate of turn */
-#define AIS_TURN_HARD_LEFT      -127
-#define AIS_TURN_HARD_RIGHT     127
-#define AIS_TURN_NOT_AVAILABLE  128
-            unsigned int speed;                 /* speed over ground in deciknots */
-#define AIS_SPEED_NOT_AVAILABLE 1023
-#define AIS_SPEED_FAST_MOVER    1022            /* >= 102.2 knots */
-            bool accuracy;                      /* position accuracy */
-#define AIS_LATLON_SCALE        600000.0
-            int lon;                            /* longitude */
-#define AIS_LON_NOT_AVAILABLE   0x6791AC0
-            int lat;                            /* latitude */
-#define AIS_LAT_NOT_AVAILABLE   0x3412140
-            unsigned int course;                /* course over ground */
-#define AIS_COURSE_NOT_AVAILABLE        3600
-            unsigned int heading;               /* true heading */
-#define AIS_HEADING_NOT_AVAILABLE       511
-            unsigned int second;                /* seconds of UTC timestamp */
-#define AIS_SEC_NOT_AVAILABLE   60
-#define AIS_SEC_MANUAL          61
-#define AIS_SEC_ESTIMATED       62
-#define AIS_SEC_INOPERATIVE     63
-            unsigned int maneuver;      /* maneuver indicator */
-            //unsigned int spare;       spare bits */
-            bool raim;                  /* RAIM flag */
-            unsigned int radio;         /* radio status bits */
-        } type1;
-        /* Type 4 - Base Station Report & Type 11 - UTC and Date Response */
-        struct {
-            unsigned int year;                  /* UTC year */
-#define AIS_YEAR_NOT_AVAILABLE  0
-            unsigned int month;                 /* UTC month */
-#define AIS_MONTH_NOT_AVAILABLE 0
-            unsigned int day;                   /* UTC day */
-#define AIS_DAY_NOT_AVAILABLE   0
-            unsigned int hour;                  /* UTC hour */
-#define AIS_HOUR_NOT_AVAILABLE  24
-            unsigned int minute;                /* UTC minute */
-#define AIS_MINUTE_NOT_AVAILABLE        60
-            unsigned int second;                /* UTC second */
-#define AIS_SECOND_NOT_AVAILABLE        60
-            bool accuracy;              /* fix quality */
-            int lon;                    /* longitude */
-            int lat;                    /* latitude */
-            unsigned int epfd;          /* type of position fix device */
-            //unsigned int spare;       spare bits */
-            bool raim;                  /* RAIM flag */
-            unsigned int radio;         /* radio status bits */
-        } type4;
-        /* Type 5 - Ship static and voyage related data */
-        struct {
-            unsigned int ais_version;   /* AIS version level */
-            unsigned int imo;           /* IMO identification */
-            char callsign[7+1];         /* callsign */ 
-#define AIS_SHIPNAME_MAXLEN     20
-            char shipname[AIS_SHIPNAME_MAXLEN+1];       /* vessel name */
-            unsigned int shiptype;      /* ship type code */
-            unsigned int to_bow;        /* dimension to bow */
-            unsigned int to_stern;      /* dimension to stern */
-            unsigned int to_port;       /* dimension to port */
-            unsigned int to_starboard;  /* dimension to starboard */
-            unsigned int epfd;          /* type of position fix deviuce */
-            unsigned int month;         /* UTC month */
-            unsigned int day;           /* UTC day */
-            unsigned int hour;          /* UTC hour */
-            unsigned int minute;        /* UTC minute */
-            unsigned int draught;       /* draft in meters */
-            char destination[20+1];     /* ship destination */
-            unsigned int dte;           /* data terminal enable */
-            //unsigned int spare;       spare bits */
-        } type5;
-        /* Type 6 - Addressed Binary Message */
-        struct {
-            unsigned int seqno;         /* sequence number */
-            unsigned int dest_mmsi;     /* destination MMSI */
-            bool retransmit;            /* retransmit flag */
-            //unsigned int spare;       spare bit(s) */
-            unsigned int dac;           /* Application ID */
-            unsigned int fid;           /* Functional ID */
-#define AIS_TYPE6_BINARY_MAX    920     /* 920 bits */
-            size_t bitcount;            /* bit count of the data */
-            union {
-                char bitdata[(AIS_TYPE6_BINARY_MAX + 7) / 8];
-                /* IMO236 - Dangerous Cargo Indication */
-                struct {
-                    char lastport[5+1];         /* Last Port Of Call */
-                    unsigned int lmonth;        /* ETA month */
-                    unsigned int lday;          /* ETA day */
-                    unsigned int lhour;         /* ETA hour */
-                    unsigned int lminute;       /* ETA minute */
-                    char nextport[5+1];         /* Next Port Of Call */
-                    unsigned int nmonth;        /* ETA month */
-                    unsigned int nday;          /* ETA day */
-                    unsigned int nhour;         /* ETA hour */
-                    unsigned int nminute;       /* ETA minute */
-                    char dangerous[20+1];       /* Main Dangerous Good */
-                    char imdcat[4+1];           /* IMD Category */
-                    unsigned int unid;          /* UN Number */
-                    unsigned int amount;        /* Amount of Cargo */
-                    unsigned int unit;          /* Unit of Quantity */
-                } dac1fid12;
-                /* IMO236 - Extended Ship Static and Voyage Related Data */
-                struct {
-                    unsigned int airdraught;    /* Air Draught */
-                } dac1fid15;
-                /* IMO236 - Number of Persons on board */
-                struct {
-                    unsigned persons;   /* number of persons */
-                } dac1fid16;
-                /* IMO289 - Clearance Time To Enter Port */
-                struct {
-                    unsigned int linkage;       /* Message Linkage ID */
-                    unsigned int month; /* Month (UTC) */
-                    unsigned int day;   /* Day (UTC) */
-                    unsigned int hour;  /* Hour (UTC) */
-                    unsigned int minute;        /* Minute (UTC) */
-                    char portname[20+1];        /* Name of Port & Berth */
-                    char destination[5+1];      /* Destination */
-                    signed int lon;     /* Longitude */
-                    signed int lat;     /* Latitude */
-                } dac1fid18;
-                /* IMO289 - Berthing Data (addressed) */
-                struct {
-                    unsigned int linkage;       /* Message Linkage ID */
-                    unsigned int berth_length;  /* Berth length */
-                    unsigned int berth_depth;   /* Berth Water Depth */
-                    unsigned int position;      /* Mooring Position */
-                    unsigned int month; /* Month (UTC) */
-                    unsigned int day;   /* Day (UTC) */
-                    unsigned int hour;  /* Hour (UTC) */
-                    unsigned int minute;        /* Minute (UTC) */
-                    unsigned int availability;  /* Services Availability */
-                    unsigned int agent; /* Agent */
-                    unsigned int fuel;  /* Bunker/fuel */
-                    unsigned int chandler;      /* Chandler */
-                    unsigned int stevedore;     /* Stevedore */
-                    unsigned int electrical;    /* Electrical */
-                    unsigned int water; /* Potable water */
-                    unsigned int customs;       /* Customs house */
-                    unsigned int cartage;       /* Cartage */
-                    unsigned int crane; /* Crane(s) */
-                    unsigned int lift;  /* Lift(s) */
-                    unsigned int medical;       /* Medical facilities */
-                    unsigned int navrepair;     /* Navigation repair */
-                    unsigned int provisions;    /* Provisions */
-                    unsigned int shiprepair;    /* Ship repair */
-                    unsigned int surveyor;      /* Surveyor */
-                    unsigned int steam; /* Steam */
-                    unsigned int tugs;  /* Tugs */
-                    unsigned int solidwaste;    /* Waste disposal (solid) */
-                    unsigned int liquidwaste;   /* Waste disposal (liquid) */
-                    unsigned int hazardouswaste;        /* Waste disposal (hazardous) */
-                    unsigned int ballast;       /* Reserved ballast exchange */
-                    unsigned int additional;    /* Additional services */
-                    unsigned int regional1;     /* Regional reserved 1 */
-                    unsigned int regional2;     /* Regional reserved 2 */
-                    unsigned int future1;       /* Reserved for future */
-                    unsigned int future2;       /* Reserved for future */
-                    char berth_name[20+1];      /* Name of Berth */
-                    signed int berth_lon;       /* Longitude */
-                    signed int berth_lat;       /* Latitude */
-                } dac1fid20;
-                /* IMO289 - Dangerous Cargo Indication */
-                struct {
-                    unsigned int unit;  /* Unit of Quantity */
-                    unsigned int amount;        /* Amount of Cargo */
-                    int ncargos;
-                    struct cargo_t {
-                        unsigned int code;      /* Cargo code */
-                        unsigned int subtype;   /* Cargo subtype */
-                    } cargos[28];
-                } dac1fid25;
-                /* IMO289 - Route info (addressed) */
-                struct route_info dac1fid28;
-                /* IMO289 - Text message (addressed) */
-                struct {
-                    unsigned int linkage;
-#define AIS_DAC1FID30_TEXT_MAX  154     /* 920 bits of six-bit, plus NUL */
-                    char text[AIS_DAC1FID30_TEXT_MAX];
-                } dac1fid30;
-                /* IMO289 & IMO236 - Tidal Window */
-                struct {
-                    unsigned int type;  /* Message Type */
-                    unsigned int repeat;        /* Repeat Indicator */
-                    unsigned int mmsi;  /* Source MMSI */
-                    unsigned int seqno; /* Sequence Number */
-                    unsigned int dest_mmsi;     /* Destination MMSI */
-                    signed int retransmit;      /* Retransmit flag */
-                    unsigned int dac;   /* DAC */
-                    unsigned int fid;   /* FID */
-                    unsigned int month; /* Month */
-                    unsigned int day;   /* Day */
-                    signed int ntidals;
-                    struct tidal_t {
-                        signed int lon; /* Longitude */
-                        signed int lat; /* Latitude */
-                        unsigned int from_hour; /* From UTC Hour */
-                        unsigned int from_min;  /* From UTC Minute */
-                        unsigned int to_hour;   /* To UTC Hour */
-                        unsigned int to_min;    /* To UTC Minute */
-#define DAC1FID32_CDIR_NOT_AVAILABLE            360
-                        unsigned int cdir;      /* Current Dir. Predicted */
-#define DAC1FID32_CSPEED_NOT_AVAILABLE          127
-                        unsigned int cspeed;    /* Current Speed Predicted */
-                    } tidals[3];
-                } dac1fid32;
-            };
-        } type6;
-        /* Type 7 - Binary Acknowledge */
-        struct {
-            unsigned int mmsi1;
-            unsigned int mmsi2;
-            unsigned int mmsi3;
-            unsigned int mmsi4;
-            /* spares ignored, they're only padding here */
-        } type7;
-        /* Type 8 - Broadcast Binary Message */
-        struct {
-            //unsigned int spare;       spare bit(s) */
-            unsigned int dac;           /* Designated Area Code */
-            unsigned int fid;           /* Functional ID */
-#define AIS_TYPE8_BINARY_MAX    952     /* 952 bits */
-            size_t bitcount;            /* bit count of the data */
-            union {
-                char bitdata[(AIS_TYPE8_BINARY_MAX + 7) / 8];
-                /* IMO236 - Fairway Closed */
-                struct {
-                    char reason[20+1];  /* Reason For Closing */
-                    char closefrom[20+1];       /* Location Of Closing From */
-                    char closeto[20+1]; /* Location of Closing To */
-                    unsigned int radius;        /* Radius extension */
-#define AIS_DAC1FID13_RADIUS_NOT_AVAILABLE 10001
-                    unsigned int extunit;       /* Unit of extension */
-#define AIS_DAC1FID13_EXTUNIT_NOT_AVAILABLE 0
-                    unsigned int fday;  /* From day (UTC) */
-                    unsigned int fmonth;        /* From month (UTC) */
-                    unsigned int fhour; /* From hour (UTC) */
-                    unsigned int fminute;       /* From minute (UTC) */
-                    unsigned int tday;  /* To day (UTC) */
-                    unsigned int tmonth;        /* To month (UTC) */
-                    unsigned int thour; /* To hour (UTC) */
-                    unsigned int tminute;       /* To minute (UTC) */
-                } dac1fid13;
-                /* IMO236 - Extended ship and voyage data */
-                struct {
-                    unsigned int airdraught;    /* Air Draught */
-                } dac1fid15;
-                /* IMO289 - VTS-generated/Synthetic Targets */
-                struct {
-                    signed int ntargets;
-                    struct target_t {
-#define DAC1FID17_IDTYPE_MMSI           0
-#define DAC1FID17_IDTYPE_IMO            1
-#define DAC1FID17_IDTYPE_CALLSIGN       2
-#define DAC1FID17_IDTYPE_OTHER          3
-                        unsigned int idtype;    /* Identifier type */
-                        union target_id {       /* Target identifier */
-                            unsigned int mmsi;
-                            unsigned int imo;
-#define DAC1FID17_ID_LENGTH             7
-                            char callsign[DAC1FID17_ID_LENGTH+1];
-                            char other[DAC1FID17_ID_LENGTH+1];
-                        } id;
-                        signed int lat;         /* Latitude */
-                        signed int lon;         /* Longitude */
-#define DAC1FID17_COURSE_NOT_AVAILABLE          360
-                        unsigned int course;    /* Course Over Ground */
-                        unsigned int second;    /* Time Stamp */
-#define DAC1FID17_SPEED_NOT_AVAILABLE           255
-                        unsigned int speed;     /* Speed Over Ground */
-                    } targets[4];
-                } dac1fid17;
-                /* IMO 289 - Marine Traffic Signal */
-                struct {
-                    unsigned int linkage;       /* Message Linkage ID */
-                    char station[20+1];         /* Name of Signal Station */
-                    signed int lon;             /* Longitude */
-                    signed int lat;             /* Latitude */
-                    unsigned int status;        /* Status of Signal */
-                    unsigned int signal;        /* Signal In Service */
-                    unsigned int hour;          /* UTC hour */
-                    unsigned int minute;        /* UTC minute */
-                    unsigned int nextsignal;    /* Expected Next Signal */
-                } dac1fid19;
-                /* IMO289 - Route info (broadcast) */
-                struct route_info dac1fid27;
-                /* IMO289 - Text message (broadcast) */
-                struct {
-                    unsigned int linkage;
-#define AIS_DAC1FID29_TEXT_MAX  162     /* 920 bits of six-bit, plus NUL */
-                    char text[AIS_DAC1FID29_TEXT_MAX];
-                } dac1fid29;
-                /* IMO236 & IMO289 - Meteorological-Hydrological data */
-                struct {
-                    bool accuracy;      /* position accuracy, <10m if true */
-#define DAC1FID31_LATLON_SCALE  1000
-                    int lon;            /* longitude in minutes * .001 */
-#define DAC1FID31_LON_NOT_AVAILABLE     (181*60*DAC1FID31_LATLON_SCALE)
-                    int lat;            /* longitude in minutes * .001 */
-#define DAC1FID31_LAT_NOT_AVAILABLE     (91*60*DAC1FID31_LATLON_SCALE)
-                    unsigned int day;           /* UTC day */
-                    unsigned int hour;          /* UTC hour */
-                    unsigned int minute;        /* UTC minute */
-                    unsigned int wspeed;        /* average wind speed */
-                    unsigned int wgust;         /* wind gust */
-#define DAC1FID31_WIND_HIGH                     126
-#define DAC1FID31_WIND_NOT_AVAILABLE            127
-                    unsigned int wdir;          /* wind direction */
-                    unsigned int wgustdir;      /* wind gust direction */
-#define DAC1FID31_DIR_NOT_AVAILABLE             360
-                    int airtemp;                /* temperature, units 0.1C */
-#define DAC1FID31_AIRTEMP_NOT_AVAILABLE         -1084
-                    unsigned int humidity;      /* relative humidity, % */
-#define DAC1FID31_HUMIDITY_NOT_AVAILABLE        101
-                    int dewpoint;               /* dew point, units 0.1C */
-#define DAC1FID31_DEWPOINT_NOT_AVAILABLE        501
-                    unsigned int pressure;      /* air pressure, hpa */
-#define DAC1FID31_PRESSURE_NOT_AVAILABLE        511
-#define DAC1FID31_PRESSURE_HIGH                 402
-                    unsigned int pressuretend;  /* tendency */
-#define DAC1FID31_PRESSURETREND_NOT_AVAILABLE   3
-                    bool visgreater;            /* visibility greater than */
-                    unsigned int visibility;    /* units 0.1 nautical miles */
-#define DAC1FID31_VISIBILITY_NOT_AVAILABLE      127
-                    int waterlevel;             /* decimeters or cm */
-#define DAC1FID11_WATERLEVEL_NOT_AVAILABLE      4001
-#define DAC1FID31_WATERLEVEL_NOT_AVAILABLE      40001
-                    unsigned int leveltrend;    /* water level trend code */
-#define DAC1FID31_LEVELTREND_NOT_AVAILABLE      3
-                    unsigned int cspeed;        /* current speed in deciknots */
-#define DAC1FID31_CSPEED_NOT_AVAILABLE          255
-                    unsigned int cdir;          /* current dir., degrees */
-                    unsigned int cspeed2;       /* current speed in deciknots */
-                    unsigned int cdir2;         /* current dir., degrees */
-                    unsigned int cdepth2;       /* measurement depth, 0.1m */
-#define DAC1FID31_CDEPTH_NOT_AVAILABLE          301
-                    unsigned int cspeed3;       /* current speed in deciknots */
-                    unsigned int cdir3;         /* current dir., degrees */
-                    unsigned int cdepth3;       /* measurement depth, 0.1m */
-                    unsigned int waveheight;    /* in decimeters */
-#define DAC1FID31_HEIGHT_NOT_AVAILABLE          31
-                    unsigned int waveperiod;    /* in seconds */
-#define DAC1FID31_PERIOD_NOT_AVAILABLE          63
-                    unsigned int wavedir;       /* direction in degrees */
-                    unsigned int swellheight;   /* in decimeters */
-                    unsigned int swellperiod;   /* in seconds */
-                    unsigned int swelldir;      /* direction in degrees */
-                    unsigned int seastate;      /* Beaufort scale, 0-12 */
-#define DAC1FID31_SEASTATE_NOT_AVAILABLE        15
-                    int watertemp;              /* units 0.1deg Celsius */
-#define DAC1FID31_PRECIPTYPE_NOT_AVAILABLE      7
-                    unsigned int preciptype;    /* 0-7, enumerated */
-                    unsigned int salinity;      /* units of 0.1% */
-#define DAC1FID31_SALINITY_NOT_AVAILABLE        510
-                    bool ice;                   /* is there sea ice? */
-                } dac1fid31;
-            };
-        } type8;
-        /* Type 9 - Standard SAR Aircraft Position Report */
-        struct {
-            unsigned int alt;           /* altitude in meters */
-#define AIS_ALT_NOT_AVAILABLE   4095
-#define AIS_ALT_HIGH            4094    /* 4094 meters or higher */
-            unsigned int speed;         /* speed over ground in deciknots */
-#define AIS_SAR_SPEED_NOT_AVAILABLE     1023
-#define AIS_SAR_FAST_MOVER      1022
-            bool accuracy;              /* position accuracy */
-            int lon;                    /* longitude */
-            int lat;                    /* latitude */
-            unsigned int course;        /* course over ground */
-            unsigned int second;        /* seconds of UTC timestamp */
-            unsigned int regional;      /* regional reserved */
-            unsigned int dte;           /* data terminal enable */
-            //unsigned int spare;       spare bits */
-            bool assigned;              /* assigned-mode flag */
-            bool raim;                  /* RAIM flag */
-            unsigned int radio;         /* radio status bits */
-        } type9;
-        /* Type 10 - UTC/Date Inquiry */
-        struct {
-            //unsigned int spare;
-            unsigned int dest_mmsi;     /* destination MMSI */
-            //unsigned int spare2;
-        } type10;
-        /* Type 12 - Safety-Related Message */
-        struct {
-            unsigned int seqno;         /* sequence number */
-            unsigned int dest_mmsi;     /* destination MMSI */
-            bool retransmit;            /* retransmit flag */
-            //unsigned int spare;       spare bit(s) */
-#define AIS_TYPE12_TEXT_MAX     157     /* 936 bits of six-bit, plus NUL */
-            char text[AIS_TYPE12_TEXT_MAX];
-        } type12;
-        /* Type 14 - Safety-Related Broadcast Message */
-        struct {
-            //unsigned int spare;       spare bit(s) */
-#define AIS_TYPE14_TEXT_MAX     161     /* 952 bits of six-bit, plus NUL */
-            char text[AIS_TYPE14_TEXT_MAX];
-        } type14;
-        /* Type 15 - Interrogation */
-        struct {
-            //unsigned int spare;       spare bit(s) */
-            unsigned int mmsi1;
-            unsigned int type1_1;
-            unsigned int offset1_1;
-            //unsigned int spare2;      spare bit(s) */
-            unsigned int type1_2;
-            unsigned int offset1_2;
-            //unsigned int spare3;      spare bit(s) */
-            unsigned int mmsi2;
-            unsigned int type2_1;
-            unsigned int offset2_1;
-            //unsigned int spare4;      spare bit(s) */
-        } type15;
-        /* Type 16 - Assigned Mode Command */
-        struct {
-            //unsigned int spare;       spare bit(s) */
-            unsigned int mmsi1;
-            unsigned int offset1;
-            unsigned int increment1;
-            unsigned int mmsi2;
-            unsigned int offset2;
-            unsigned int increment2;
-        } type16;
-        /* Type 17 - GNSS Broadcast Binary Message */
-        struct {
-            //unsigned int spare;       spare bit(s) */
-#define AIS_GNSS_LATLON_SCALE   600.0
-            int lon;                    /* longitude */
-            int lat;                    /* latitude */
-            //unsigned int spare2;      spare bit(s) */
-#define AIS_TYPE17_BINARY_MAX   736     /* 920 bits */
-            size_t bitcount;            /* bit count of the data */
-            char bitdata[(AIS_TYPE17_BINARY_MAX + 7) / 8];
-        } type17;
-        /* Type 18 - Standard Class B CS Position Report */
-        struct {
-            unsigned int reserved;      /* altitude in meters */
-            unsigned int speed;         /* speed over ground in deciknots */
-            bool accuracy;              /* position accuracy */
-            int lon;                    /* longitude */
-#define AIS_GNS_LON_NOT_AVAILABLE       0x1a838
-            int lat;                    /* latitude */
-#define AIS_GNS_LAT_NOT_AVAILABLE       0xd548
-            unsigned int course;        /* course over ground */
-            unsigned int heading;       /* true heading */
-            unsigned int second;        /* seconds of UTC timestamp */
-            unsigned int regional;      /* regional reserved */
-            bool cs;                    /* carrier sense unit flag */
-            bool display;               /* unit has attached display? */
-            bool dsc;                   /* unit attached to radio with DSC? */
-            bool band;                  /* unit can switch frequency bands? */
-            bool msg22;                 /* can accept Message 22 management? */
-            bool assigned;              /* assigned-mode flag */
-            bool raim;                  /* RAIM flag */
-            unsigned int radio;         /* radio status bits */
-        } type18;
-        /* Type 19 - Extended Class B CS Position Report */
-        struct {
-            unsigned int reserved;      /* altitude in meters */
-            unsigned int speed;         /* speed over ground in deciknots */
-            bool accuracy;              /* position accuracy */
-            int lon;                    /* longitude */
-            int lat;                    /* latitude */
-            unsigned int course;        /* course over ground */
-            unsigned int heading;       /* true heading */
-            unsigned int second;        /* seconds of UTC timestamp */
-            unsigned int regional;      /* regional reserved */
-            char shipname[AIS_SHIPNAME_MAXLEN+1];               /* ship name */
-            unsigned int shiptype;      /* ship type code */
-            unsigned int to_bow;        /* dimension to bow */
-            unsigned int to_stern;      /* dimension to stern */
-            unsigned int to_port;       /* dimension to port */
-            unsigned int to_starboard;  /* dimension to starboard */
-            unsigned int epfd;          /* type of position fix deviuce */
-            bool raim;                  /* RAIM flag */
-            unsigned int dte;           /* date terminal enable */
-            bool assigned;              /* assigned-mode flag */
-            //unsigned int spare;       spare bits */
-        } type19;
-        /* Type 20 - Data Link Management Message */
-        struct {
-            //unsigned int spare;       spare bit(s) */
-            unsigned int offset1;       /* TDMA slot offset */
-            unsigned int number1;       /* number of xlots to allocate */
-            unsigned int timeout1;      /* allocation timeout */
-            unsigned int increment1;    /* repeat increment */
-            unsigned int offset2;       /* TDMA slot offset */
-            unsigned int number2;       /* number of xlots to allocate */
-            unsigned int timeout2;      /* allocation timeout */
-            unsigned int increment2;    /* repeat increment */
-            unsigned int offset3;       /* TDMA slot offset */
-            unsigned int number3;       /* number of xlots to allocate */
-            unsigned int timeout3;      /* allocation timeout */
-            unsigned int increment3;    /* repeat increment */
-            unsigned int offset4;       /* TDMA slot offset */
-            unsigned int number4;       /* number of xlots to allocate */
-            unsigned int timeout4;      /* allocation timeout */
-            unsigned int increment4;    /* repeat increment */
-        } type20;
-        /* Type 21 - Aids to Navigation Report */
-        struct {
-            unsigned int aid_type;      /* aid type */
-            char name[35];              /* name of aid to navigation */
-            bool accuracy;              /* position accuracy */
-            int lon;                    /* longitude */
-            int lat;                    /* latitude */
-            unsigned int to_bow;        /* dimension to bow */
-            unsigned int to_stern;      /* dimension to stern */
-            unsigned int to_port;       /* dimension to port */
-            unsigned int to_starboard;  /* dimension to starboard */
-            unsigned int epfd;          /* type of EPFD */
-            unsigned int second;        /* second of UTC timestamp */
-            bool off_position;          /* off-position indicator */
-            unsigned int regional;      /* regional reserved field */
-            bool raim;                  /* RAIM flag */
-            bool virtual_aid;           /* is virtual station? */
-            bool assigned;              /* assigned-mode flag */
-            //unsigned int spare;       unused */
-        } type21;
-        /* Type 22 - Channel Management */
-        struct {
-            //unsigned int spare;       spare bit(s) */
-            unsigned int channel_a;     /* Channel A number */
-            unsigned int channel_b;     /* Channel B number */
-            unsigned int txrx;          /* transmit/receive mode */
-            bool power;                 /* high-power flag */
-#define AIS_CHANNEL_LATLON_SCALE        600.0
-            union {
-                struct {
-                    int ne_lon;         /* NE corner longitude */
-                    int ne_lat;         /* NE corner latitude */
-                    int sw_lon;         /* SW corner longitude */
-                    int sw_lat;         /* SW corner latitude */
-                } area;
-                struct {
-                    unsigned int dest1; /* addressed station MMSI 1 */
-                    unsigned int dest2; /* addressed station MMSI 2 */
-                } mmsi;
-            };
-            bool addressed;             /* addressed vs. broadast flag */
-            bool band_a;                /* fix 1.5kHz band for channel A */
-            bool band_b;                /* fix 1.5kHz band for channel B */
-            unsigned int zonesize;      /* size of transitional zone */
-        } type22;
-        /* Type 23 - Group Assignment Command */
-        struct {
-            int ne_lon;                 /* NE corner longitude */
-            int ne_lat;                 /* NE corner latitude */
-            int sw_lon;                 /* SW corner longitude */
-            int sw_lat;                 /* SW corner latitude */
-            //unsigned int spare;       spare bit(s) */
-            unsigned int stationtype;   /* station type code */
-            unsigned int shiptype;      /* ship type code */
-            //unsigned int spare2;      spare bit(s) */
-            unsigned int txrx;          /* transmit-enable code */
-            unsigned int interval;      /* report interval */
-            unsigned int quiet;         /* quiet time */
-            //unsigned int spare3;      spare bit(s) */
-        } type23;
-        /* Type 24 - Class B CS Static Data Report */
-        struct {
-            char shipname[AIS_SHIPNAME_MAXLEN+1];       /* vessel name */
-            unsigned int shiptype;      /* ship type code */
-            char vendorid[8];           /* vendor ID */
-            char callsign[8];           /* callsign */
-            union {
-                unsigned int mothership_mmsi;   /* MMSI of main vessel */
-                struct {
-                    unsigned int to_bow;        /* dimension to bow */
-                    unsigned int to_stern;      /* dimension to stern */
-                    unsigned int to_port;       /* dimension to port */
-                    unsigned int to_starboard;  /* dimension to starboard */
-                } dim;
-            };
-        } type24;
-        /* Type 25 - Addressed Binary Message */
-        struct {
-            bool addressed;             /* addressed-vs.broadcast flag */
-            bool structured;            /* structured-binary flag */
-            unsigned int dest_mmsi;     /* destination MMSI */
-            unsigned int app_id;        /* Application ID */
-#define AIS_TYPE25_BINARY_MAX   128     /* Up to 128 bits */
-            size_t bitcount;            /* bit count of the data */
-            char bitdata[(AIS_TYPE25_BINARY_MAX + 7) / 8];
-        } type25;
-        /* Type 26 - Addressed Binary Message */
-        struct {
-            bool addressed;             /* addressed-vs.broadcast flag */
-            bool structured;            /* structured-binary flag */
-            unsigned int dest_mmsi;     /* destination MMSI */
-            unsigned int app_id;        /* Application ID */
-#define AIS_TYPE26_BINARY_MAX   1004    /* Up to 128 bits */
-            size_t bitcount;            /* bit count of the data */
-            char bitdata[(AIS_TYPE26_BINARY_MAX + 7) / 8];
-            unsigned int radio;         /* radio status bits */
-        } type26;
-        /* Type 27 - Long Range AIS Broadcast message */
-        struct {
-            bool accuracy;              /* position accuracy */
-            bool raim;                  /* RAIM flag */
-            unsigned int status;        /* navigation status */
-#define AIS_LONGRANGE_LATLON_SCALE      600.0
-            int lon;                    /* longitude */
-#define AIS_LONGRANGE_LON_NOT_AVAILABLE 0x1a838
-            int lat;                    /* latitude */
-#define AIS_LONGRANGE_LAT_NOT_AVAILABLE 0xd548
-            unsigned int speed;         /* speed over ground in deciknots */
-#define AIS_LONGRANGE_SPEED_NOT_AVAILABLE 63
-            unsigned int course;        /* course over ground */
-#define AIS_LONGRANGE_COURSE_NOT_AVAILABLE 511
-            bool gnss;                  /* are we reporting GNSS position? */
-        } type27;
-    };
-};
-
-struct attitude_t {
-    double heading;
-    double pitch;
-    double roll;
-    double yaw;
-    double dip;
-    double mag_len; /* unitvector sqrt(x^2 + y^2 +z^2) */
-    double mag_x;
-    double mag_y;
-    double mag_z;
-    double acc_len; /* unitvector sqrt(x^2 + y^2 +z^2) */
-    double acc_x;
-    double acc_y;
-    double acc_z;
-    double gyro_x;
-    double gyro_y;
-    double temp;
-    double depth;
-    /* compass status -- TrueNorth (and any similar) devices only */
-    char mag_st;
-    char pitch_st;
-    char roll_st;
-    char yaw_st;
-};
-
-struct dop_t {
-    /* Dilution of precision factors */
-    double xdop, ydop, pdop, hdop, vdop, tdop, gdop;
-};
-
-struct rawdata_t {
-    /* raw measurement data */
-    double codephase[MAXCHANNELS];      /* meters */
-    double carrierphase[MAXCHANNELS];   /* meters */
-    double pseudorange[MAXCHANNELS];    /* meters */
-    double deltarange[MAXCHANNELS];     /* meters/sec */
-    double doppler[MAXCHANNELS];        /* Hz */
-    double mtime[MAXCHANNELS];          /* sec */
-    unsigned satstat[MAXCHANNELS];      /* tracking status */
-#define SAT_ACQUIRED    0x01            /* satellite acquired */
-#define SAT_CODE_TRACK  0x02            /* code-tracking loop acquired */
-#define SAT_CARR_TRACK  0x04            /* carrier-tracking loop acquired */
-#define SAT_DATA_SYNC   0x08            /* data-bit synchronization done */
-#define SAT_FRAME_SYNC  0x10            /* frame synchronization done */
-#define SAT_EPHEMERIS   0x20            /* ephemeris collected */
-#define SAT_FIX_USED    0x40            /* used for position fix */
-};
-
-struct version_t {
-    char release[64];                   /* external version */
-    char rev[64];                       /* internal revision ID */
-    int proto_major, proto_minor;       /* API major and minor versions */
-    char remote[GPS_PATH_MAX];          /* could be from a remote device */
-};
-
-struct devconfig_t {
-    char path[GPS_PATH_MAX];
-    int flags;
-#define SEEN_GPS        0x01
-#define SEEN_RTCM2      0x02
-#define SEEN_RTCM3      0x04
-#define SEEN_AIS        0x08
-    char driver[64];
-    char subtype[64];
-    double activated;
-    unsigned int baudrate, stopbits;    /* RS232 link parameters */
-    char parity;                        /* 'N', 'O', or 'E' */
-    double cycle, mincycle;             /* refresh cycle time in seconds */
-    int driver_mode;                    /* is driver in native mode or not? */
-};
-
-struct policy_t {
-    bool watcher;                       /* is watcher mode on? */
-    bool json;                          /* requesting JSON? */
-    bool nmea;                          /* requesting dumping as NMEA? */
-    int raw;                            /* requesting raw data? */
-    bool scaled;                        /* requesting report scaling? */ 
-    bool timing;                        /* requesting timing info */
-    int loglevel;                       /* requested log level of messages */
-    char devpath[GPS_PATH_MAX];         /* specific device to watch */
-    char remote[GPS_PATH_MAX];          /* ...if this was passthrough */
-};
-
-/* 
- * Someday we may support Windows, under which socket_t is a separate type.
- * In the meantime, having a typedef for this semantic kind is no bad thing,
- * as it makes clearer what some declarations are doing without breaking
- * binary compatibility. 
- */
-typedef int socket_t;
-
-/* mode flags for setting streaming policy */
-#define WATCH_ENABLE    0x000001u       /* enable streaming */
-#define WATCH_DISABLE   0x000002u       /* disable watching */
-#define WATCH_JSON      0x000010u       /* JSON output */
-#define WATCH_NMEA      0x000020u       /* output in NMEA */
-#define WATCH_RARE      0x000040u       /* output of packets in hex */
-#define WATCH_RAW       0x000080u       /* output of raw packets */
-#define WATCH_SCALED    0x000100u       /* scale output to floats */ 
-#define WATCH_TIMING    0x000200u       /* timing information */
-#define WATCH_DEVICE    0x000800u       /* watch specific device */
-#define WATCH_NEWSTYLE  0x010000u       /* force JSON streaming */
-#define WATCH_OLDSTYLE  0x020000u       /* force old-style streaming */
-
-/* 
- * Main structure that includes all previous substructures
- */
-
-struct gps_data_t {
-    gps_mask_t set;     /* has field been set since this was last cleared? */
-#define ONLINE_SET      (1llu<<1)
-#define TIME_SET        (1llu<<2)
-#define TIMERR_SET      (1llu<<3)
-#define LATLON_SET      (1llu<<4)
-#define ALTITUDE_SET    (1llu<<5)
-#define SPEED_SET       (1llu<<6)
-#define TRACK_SET       (1llu<<7)
-#define CLIMB_SET       (1llu<<8)
-#define STATUS_SET      (1llu<<9)
-#define MODE_SET        (1llu<<10)
-#define DOP_SET         (1llu<<11)
-#define HERR_SET        (1llu<<12)
-#define VERR_SET        (1llu<<13)
-#define ATTITUDE_SET    (1llu<<14)
-#define SATELLITE_SET   (1llu<<15)
-#define SPEEDERR_SET    (1llu<<16)
-#define TRACKERR_SET    (1llu<<17)
-#define CLIMBERR_SET    (1llu<<18)
-#define DEVICE_SET      (1llu<<19)
-#define DEVICELIST_SET  (1llu<<20)
-#define DEVICEID_SET    (1llu<<21)
-#define RTCM2_SET       (1llu<<22)
-#define RTCM3_SET       (1llu<<23)
-#define AIS_SET         (1llu<<24)
-#define PACKET_SET      (1llu<<25)
-#define SUBFRAME_SET    (1llu<<26)
-#define GST_SET         (1llu<<27)
-#define VERSION_SET     (1llu<<28)
-#define POLICY_SET      (1llu<<29)
-#define LOGMESSAGE_SET  (1llu<<30)
-#define ERROR_SET       (1llu<<31)
-#define SET_HIGH_BIT    31
-    timestamp_t online;         /* NZ if GPS is on line, 0 if not.
-                                 *
-                                 * Note: gpsd clears this time when sentences
-                                 * fail to show up within the GPS's normal
-                                 * send cycle time. If the host-to-GPS 
-                                 * link is lossy enough to drop entire
-                                 * sentences, this field will be
-                                 * prone to false zero values.
-                                 */
-
-#ifndef USE_QT
-    socket_t gps_fd;            /* socket or file descriptor to GPS */
-#else
-    void* gps_fd;
-#endif
-    struct gps_fix_t    fix;    /* accumulated PVT data */
-
-    double separation;          /* Geoidal separation, MSL - WGS84 (Meters) */
-
-    /* GPS status -- always valid */
-    int    status;              /* Do we have a fix? */
-#define STATUS_NO_FIX   0       /* no */
-#define STATUS_FIX      1       /* yes, without DGPS */
-#define STATUS_DGPS_FIX 2       /* yes, with DGPS */
-
-    /* precision of fix -- valid if satellites_used > 0 */
-    int satellites_used;        /* Number of satellites used in solution */
-    int used[MAXCHANNELS];      /* PRNs of satellites used in solution */
-    struct dop_t dop;
-
-    /* redundant with the estimate elements in the fix structure */
-    double epe;  /* spherical position error, 95% confidence (meters)  */
-
-    /* satellite status -- valid when satellites_visible > 0 */
-    timestamp_t skyview_time;   /* skyview timestamp */
-    int satellites_visible;     /* # of satellites in view */
-    int PRN[MAXCHANNELS];       /* PRNs of satellite */
-    int elevation[MAXCHANNELS]; /* elevation of satellite */
-    int azimuth[MAXCHANNELS];   /* azimuth */
-    double ss[MAXCHANNELS];     /* signal-to-noise ratio (dB) */
-
-    struct devconfig_t dev;     /* device that shipped last update */
-
-    struct policy_t policy;     /* our listening policy */
-
-    /* should be moved to privdata sometday */
-    char tag[MAXTAGLEN+1];      /* tag of last sentence processed */
-
-    /* pack things never reported together to reduce structure size */ 
-#define UNION_SET       (RTCM2_SET|RTCM3_SET|SUBFRAME_SET|AIS_SET|ATTITUDE_SET|VERSION_SET|DEVICELIST_SET|LOGMESSAGE_SET|ERROR_SET|GST_SET|VERSION_SET)
-    union {
-        /* unusual forms of sensor data that might come up the pipe */ 
-        struct rtcm2_t  rtcm2;
-        struct rtcm3_t  rtcm3;
-        struct subframe_t subframe;
-        struct ais_t ais;
-        struct attitude_t attitude;
-        struct rawdata_t raw;
-        struct gst_t gst;
-        /* "artificial" structures for various protocol responses */
-        struct version_t version;
-        struct {
-            timestamp_t time;
-            int ndevices;
-            struct devconfig_t list[MAXUSERDEVS];
-        } devices;
-        char error[256];
-    };
-
-    /* Private data - client code must not set this */
-    void *privdata;
-};
-
-extern int gps_open(/*@null@*/const char *, /*@null@*/const char *, 
-                      /*@out@*/struct gps_data_t *);
-extern int gps_close(struct gps_data_t *);
-extern int gps_send(struct gps_data_t *, const char *, ... );
-extern int gps_read(/*@out@*/struct gps_data_t *);
-extern int gps_unpack(char *, struct gps_data_t *);
-extern bool gps_waiting(const struct gps_data_t *, int);
-extern int gps_stream(struct gps_data_t *, unsigned int, /*@null@*/void *);
-extern const char /*@observer@*/ *gps_data(const struct gps_data_t *);
-extern const char /*@observer@*/ *gps_errstr(const int);
-
-extern int gps_sock_open(/*@null@*/const char *, /*@null@*/const char *, 
-                      /*@out@*/struct gps_data_t *);
-extern int gps_sock_read(/*@out@*/struct gps_data_t *);
-extern int gps_sock_close(struct gps_data_t *);
-extern int gps_sock_send(struct gps_data_t *, const char *);
-extern int gps_shm_open(/*@out@*/struct gps_data_t *);
-extern int gps_shm_read(struct gps_data_t *);
-extern bool gps_sock_waiting(const struct gps_data_t *, int);
-extern int gps_sock_stream(struct gps_data_t *, unsigned int, /*@null@*/void *);
-extern const char /*@observer@*/ *gps_sock_data(const struct gps_data_t *);
-extern void gps_shm_close(struct gps_data_t *);
-
-extern void libgps_trace(int errlevel, const char *, ...);
-
-/* dependencies on struct gpsdata_t end hrere */
-
-extern void gps_clear_fix(/*@ out @*/struct gps_fix_t *);
-extern void gps_clear_dop( /*@out@*/ struct dop_t *);
-extern void gps_merge_fix(/*@ out @*/struct gps_fix_t *,
-                          gps_mask_t,
-                          /*@ in @*/struct gps_fix_t *);
-extern void gps_enable_debug(int, FILE *);
-extern /*@observer@*/const char *gps_maskdump(gps_mask_t);
-
-extern double safe_atof(const char *);
-extern time_t mkgmtime(register struct tm *);
-extern timestamp_t timestamp(void);
-extern timestamp_t iso8601_to_unix(char *);
-extern /*@observer@*/char *unix_to_iso8601(timestamp_t t, /*@ out @*/char[], size_t len);
-extern double earth_distance(double, double, double, double);
-extern double earth_distance_and_bearings(double, double, double, double, 
-                                          /*@null@*//*@out@*/double *, 
-                                          /*@null@*//*@out@*/double *);
-extern double wgs84_separation(double, double);
-
-/* some multipliers for interpreting GPS output */
-#define METERS_TO_FEET  3.2808399       /* Meters to U.S./British feet */
-#define METERS_TO_MILES 0.00062137119   /* Meters to miles */
-#define KNOTS_TO_MPH    1.1507794       /* Knots to miles per hour */
-#define KNOTS_TO_KPH    1.852           /* Knots to kilometers per hour */
-#define KNOTS_TO_MPS    0.51444444      /* Knots to meters per second */
-#define MPS_TO_KPH      3.6             /* Meters per second to klicks/hr */
-#define MPS_TO_MPH      2.2369363       /* Meters/second to miles per hour */
-#define MPS_TO_KNOTS    1.9438445       /* Meters per second to knots */
-/* miles and knots are both the international standard versions of the units */
-
-/* angle conversion multipliers */
-#define GPS_PI          3.1415926535897932384626433832795029
-#define RAD_2_DEG       57.2957795130823208767981548141051703
-#define DEG_2_RAD       0.0174532925199432957692369076848861271
-
-/* geodetic constants */
-#define WGS84A 6378137          /* equatorial radius */
-#define WGS84F 298.257223563    /* flattening */
-#define WGS84B 6356752.3142     /* polar radius */
-
-/* netlib_connectsock() errno return values */
-#define NL_NOSERVICE    -1      /* can't get service entry */
-#define NL_NOHOST       -2      /* can't get host entry */
-#define NL_NOPROTO      -3      /* can't get protocol entry */
-#define NL_NOSOCK       -4      /* can't create socket */
-#define NL_NOSOCKOPT    -5      /* error SETSOCKOPT SO_REUSEADDR */
-#define NL_NOCONNECT    -6      /* can't connect to host/socket pair */
-#define SHM_NOSHARED    -7      /* shared-memory segment not available */
-#define SHM_NOATTACH    -8      /* shared-memory attach failed */
-
-#define DEFAULT_GPSD_PORT       "2947"  /* IANA assignment */
-#define DEFAULT_RTCM_PORT       "2101"  /* IANA assignment */
-
-/* special host values for non-socket exports */ 
-#define GPSD_SHARED_MEMORY      "shared memory"
-
-/*
- * Platform-specific declarations
- */
-
-#ifdef _WIN32
-#define strtok_r(s,d,p) strtok_s(s,d,p)
-#endif
-
-/* Some libc's don't have strlcat/strlcpy. Local copies are provided */
-#ifndef HAVE_STRLCAT
-size_t strlcat(/*@out@*/char *dst, /*@in@*/const char *src, size_t size);
-#endif
-#ifndef HAVE_STRLCPY
-size_t strlcpy(/*@out@*/char *dst, /*@in@*/const char *src, size_t size);
-#endif
-
-#ifdef __cplusplus
-}  /* End of the 'extern "C"' block */
-#endif
-
-/* gps.h ends here */
-#endif /* _GPSD_GPS_H_ */