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1655 giacomo 1
#define GPVTG "GPVTG"
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#define GPGGA "GPGGA"
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#define GPGSA "GPGSA"
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#define GPGSV "GPGSV"
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#define GPRMC "GPRMC"
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#define PRWIZCH "PRWIZCH"
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struct OUTDATA {
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    int fdin;
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    int fdout;
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    int last_update;            /* When we got last data from GPS receiver */
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    long cmask;
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    char utc[20];               /* UTC date / time in format "mm/dd/yy hh:mm:ss" */
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    double latitude;            /* Latitude and longitude in format "d.ddddd" */
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    double longitude;
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    char grid[7];
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    double altitude;            /* Altitude in meters */
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    double speed;               /* Speed over ground, knots */
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    double track;               /* Track made good, degress True */
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    int satellites;             /* Number of satellites used in solution */
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    int status;                 /* 0 = no fix, 1 = fix, 2 = dgps fix */
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    int mode;                   /* 1 = no fix, 2 = 2D, 3 = 3D */
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    double pdop;                /* Position dilution of precision */
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    double hdop;                /* Horizontal dilution of precision */
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    double vdop;                /* Vertical dilution of precision */
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    int in_view;                /* # of satellites in view */
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    int PRN[12];                /* PRN of satellite */
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    int elevation[12];          /* elevation of satellite */
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    int azimuth[12];            /* azimuth */
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    int ss[12];                 /* signal strength */
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    int used[12];               /* used in solution */
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    int ZCHseen;                /* flag */
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    int Zs[12];                 /* for the rockwell PRWIZCH */
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    int Zv[12];                 /*                  value */
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    int year;
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    int month;
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    int day;
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    int hours;
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    int minutes;
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    int seconds;
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    double separation;
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    double mag_var;
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    double course;
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    int seen[12];
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    int valid[12];              /* signal valid */
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};
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#define C_LATLON        1
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#define C_SAT           2
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#define C_ZCH           4
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/* prototypes */
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extern void doNMEA(short refNum);
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extern void processGPVTG(char *sentence);
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extern void processGPRMC(char *sentence);
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extern void processGPGGA(char *sentence);
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extern void processGPGSV(char *sentence);
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extern void processPRWIZCH(char *sentence);
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extern void processGPGSA(char *sentence);
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extern void process_message(char *sentence);
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extern void add_checksum(char *sentence);
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extern short checksum(char *sentence);
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extern struct OUTDATA gNMEAdata;