G7TO Reads Garmin Position Velocity Text (PVT) Output Using the DOS version of G7To (20 Aug 1998) NOTE: Set the GPS to the GARMIN mode: The latest Garmin receivers, i.e. the 12XL version 3.53, the GPSII+ version 2.07 and I believe the units with the new city data base all have a record that can be sent which contains 'new' data. g7to will download this data as a csv record. Note the 'east', 'north' and 'up' parameters: The DOS command, g7to -i g45g > pvt.txt, will start the GPS sending PVT data approximately once a second. Typing an 'X' or 'x' will cause the data flow to stop and g7to will exit. Each data element in the output file pvt.txt is separated by a comma. The data values are: alt -- altitude above WGS 84 ellipsoid (meters) epe -- estimated position error, 2 sigma (meters) eph -- epe, but horizontal only (meters) epv -- epe, but vertical only (meters) fix -- type of position fix nusable = 0 failed integrity check invalid = 1 invalid or unavailable 2D = 2 two dimensional 3D = 3 three dimensional 2D_diff = 4 two dimensional differential 3D_diff = 5 three dimensional differential tow -- time of week (seconds)--The number of seconds into the current week latitude -- N is positive and S is negative in degrees longitude -- E is positive and W is negative. in degrees east -- velocity east (meters/second) north -- velocity north (meters/second) up -- velocity up (meters/second) msl_hght -- height of WGS 84 ellipsoid above MSL (meters) leap_scnds -- difference between GPS and UTC (seconds) wn_days -- week number days--the number of days since Jan 1st, 1990 to the beginning of the current week. To just view the data stream on the screen, use the command: g7to -i g45g Ron Henderson