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JLR-7700 MK2 GPS Navigator
VTG sentence
$GPVTG,xxx,T,xxx,M,xx.x,N,xx.x,K*hh<CR><LF>
1234 5 67 89
1 and 2 : True course (degree)
3 and 4 : Magnetic course (degree)
5 and 6 : Speed (knot), the unit is fixed to N (knot)
7 and 8 : Speed (km/h), the unit is fixed to K (km)
9 : Checksum
XTE sentence
$GPXTE,A,,x.xx,a,N*hh<CR><LF>
12345
1 : Status, A= Valid, V = Invalid
2 : Cross-track error (NM)
3 : Direction to steer (L or R)
4 : Unit is fixed to N (nautical mile)
5 : Checksum
ZDA sentence
$GPZDA,hhmmss,xx,xx,xxxx,xx,xx*hh<CR><LF>
1 23 4 567
1 : UTC time (hour, minute, and second)
2 : Day (UTC)
3 : Month (UTC)
4 : Year (UTC)
5 : Hour (local zone)
6 : Minute (local zone)
7 : Checksum
DTM sentence
$GPDTM,ccc, a, , , , , , ccc*hh<CR><LF>
12 3
1 : Local datum W84 ─ WGS84, W72 ─ WGS72,
ccc ─ another datum number (see Attachment 2-B table 1 and 2)
2 : Null (Local datum subdivision code)
3 : W84 (Reference datum)
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