Field name    - length   - notes
-----------------------------------

INDEX         - 6 chars  - record number, no leading zeros and spaces
TAG           - 1 char   - T-trackpoing, C-waypoint, V-voicetagged point

DATE          - 6 chars  - YYMMDD
TIME          - 6 chars  - HHMMSS
LATITUDE N/S  - 10 chars - DD.DDDDDDN (last char: N or S)
LONGITUDE E/W - 11 chars - DDD.DDDDDDE (E or W; degree is leftpadded to DDD by zero)

HEIGHT        - 5 chars  - in meters
SPEED         - 4 chars  - in km/h, no decimals :-(
HEADING       - 3 chars  - degrees
FIX MODE      - 2 chars  - 3D (I've never seen smth else)
VALID         - 4 chars  - SPS or DGPS (SPS is
 padded with space)
PDOP          - 5 chars  - XX.XX (no leading zeros if above 1)
HDOP          - 5 chars  - XX.XX (no leading zeros if above 1)
VDOP          - 5 chars  - XX.XX (no leading zeros if above 1)

VOX           - 9 chars  - VOX00001 etc. - filename when TAG=V