Add GISTeq to NMEA writer.

diff --git a/nmea.c b/nmea.c
index f9ea6d2efb9dbd14ebb3575ea27def5907257526..de9ae50c48c85238f41f999279d11e798edb7d9c 100644 (file)
--- a/nmea.c
+++ b/nmea.c
@@ -173,6 +173,7 @@ static char *getposnarg;
 static char *opt_sleep;
 static char *opt_baud;
 static char *opt_append;
+static char *opt_gisteq;
 
 static long sleepus;
 static int getposn;
@@ -197,6 +198,7 @@ arglist_t nmea_args[] = {
        {"pause", &opt_sleep, "Decimal seconds to pause between groups of strings", NULL, ARGTYPE_INT, ARG_NOMINMAX },
        {"append_positioning", &opt_append, "Append realtime positioning data to the output file instead of truncating", "0", ARGTYPE_BOOL, ARG_NOMINMAX },
        {"baud", &opt_baud, "Speed in bits per second of serial port (baud=4800)", NULL, ARGTYPE_INT, ARG_NOMINMAX },
+       {"gisteq", &opt_gisteq, "Write tracks for Gisteq Phototracker", "0", ARGTYPE_BOOL, ARG_NOMINMAX },
        ARG_TERMINATOR
 };
 
@@ -326,6 +328,12 @@ nmea_wr_init(const char *portname)
 
        mkshort_handle = mkshort_new_handle();
        setshort_length(mkshort_handle, atoi(snlenopt));
+
+       if (opt_gisteq) {
+               opt_gpgga = NULL;
+               opt_gpvtg = NULL;
+               opt_gpgsa = NULL;
+       }
 }
 
 static  void
@@ -1218,6 +1226,10 @@ nmea_trackpt_pr(const waypoint *wpt)
                                WAYPT_HAS(wpt, course) ? (wpt->course):(0),
                                (int) ymd);
                cksum = nmea_cksum(obuf);
+               /* GISTeq doesn't care about the checksum */
+               if (opt_gisteq) {
+                       gbfprintf(file_out, "---,");
+               }
                gbfprintf(file_out, "$%s*%02X\n", obuf, cksum);
        }
        if (opt_gpgga) {