Garmin LVC 18 Technical Specification - Page 32

The USB Packet for the Satellite Record looks like: - 0x72 (Record ID - single byte) - 0x54 (Number of data bytes - single byte) - cpo_all_sat_data Position Record The Position Record has a record identifier of typedef struct { float alt; float epe; float eph; float epv; int fix; double gps_tow; double lat; double lon; float lon_vel; float lat_vel; float alt_vel; float msl_hght; int leap_sec; long grmn_days; } cpo_pvt_data; alt epe eph epv fix gps_tow lat lon lon_vel lat_vel alt_vel msl_hght leap_sec grmn_days Ellipsoid altitude (meters) Est pos error (meters) Pos err, horizontal (meters) Pos err, vertical (meters) 0 = no fix; 1 = no fix; 2 = 2D; 3 = 3D; 4 = 2D differential; 5 = 3D differential; 6 and greater = not defined GPS time of week (sec) Latitude (radians) Longitude (radians) Longitude velocity (meters/second) Latitude velocity (meters/second) Altitude velocity (meters/second) Mean sea level height (meters) UTC leap seconds Garmin days (days since December 31, 1989) GPS 18 Technical Specifications (190-00307-00) Page 26 Rev. D