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GPS format [writelog] The format for each gps message is: time (float): current GPS time, in seconds latitude (float): in degrees longitude (float): in degrees altitude (float): in meters utm_e (float): UTM WGS84 easting, in meters utm_n (float): UTM WGS84 northing, in meters hdop (float): horizontal dilution of position vdop (float): vertical dilution of position err_horz (float): horizontal error, in meters err_vert (float): vertical error, in meters quality (int): quality of fix (0 = invalid, 1 = GPS fix, 2 = DGPS fix) num_sats (int): number of satellites in view