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#define GPVTG "GPVTG"
#define GPGGA "GPGGA"
#define GPGSA "GPGSA"
#define GPGSV "GPGSV"
#define GPRMC "GPRMC"
#define PRWIZCH "PRWIZCH"

struct OUTDATA {
    int fdin;
    int fdout;

    int last_update;            /* When we got last data from GPS receiver */

    long cmask;
    char utc[20];               /* UTC date / time in format "mm/dd/yy hh:mm:ss" */

    double latitude;            /* Latitude and longitude in format "d.ddddd" */

    double longitude;

    char grid[7];

    double altitude;            /* Altitude in meters */

    double speed;               /* Speed over ground, knots */

    double track;               /* Track made good, degress True */

    int satellites;             /* Number of satellites used in solution */

    int status;                 /* 0 = no fix, 1 = fix, 2 = dgps fix */

    int mode;                   /* 1 = no fix, 2 = 2D, 3 = 3D */

    double pdop;                /* Position dilution of precision */

    double hdop;                /* Horizontal dilution of precision */

    double vdop;                /* Vertical dilution of precision */

    int in_view;                /* # of satellites in view */

    int PRN[12];                /* PRN of satellite */

    int elevation[12];          /* elevation of satellite */

    int azimuth[12];            /* azimuth */

    int ss[12];                 /* signal strength */

    int used[12];               /* used in solution */

    int ZCHseen;                /* flag */

    int Zs[12];                 /* for the rockwell PRWIZCH */

    int Zv[12];                 /*                  value */

    int year;

    int month;

    int day;

    int hours;

    int minutes;

    int seconds;

    double separation;

    double mag_var;

    double course;

    int seen[12];

    int valid[12];              /* signal valid */
};

#define C_LATLON        1
#define C_SAT           2
#define C_ZCH           4

/* prototypes */
extern void doNMEA(short refNum);
extern void processGPVTG(char *sentence);
extern void processGPRMC(char *sentence);
extern void processGPGGA(char *sentence);
extern void processGPGSV(char *sentence);
extern void processPRWIZCH(char *sentence);
extern void processGPGSA(char *sentence);
extern void process_message(char *sentence);
extern void add_checksum(char *sentence);
extern short checksum(char *sentence);
extern struct OUTDATA gNMEAdata;