typedef enum { GPSRECEIVER_SIRF = 0, GPSRECEIVER_ROCKWELL, GPSRECEIVER_GARMIN, GPSRECEIVER_MAGELLAN, GPSRECEIVER_JRC, GPSRECEIVER_NAVICOM, GPSRECEIVER_SONY, GPSRECEIVER_EMTAC, GPSRECEIVER_UNKNOWN } GPSRECEIVER;