Appendix 05 - 2
NMEA – RMB Sentence.
$GPRMB,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>*hhCRLF
1. Position valid (A = valid, V = invalid).
2. XX.XX Cross track error in nautical miles.
3. X Direction to steer (L = left, R = right).
4. XXXX Four character start waypoint identifier. (first four characters of name).
5. XXXX Four character destination waypoint identifier.
6. DDMM.MM Destination Lat.
7. X Destination hemisphere (N or S).
8. DDDMM.MM Destination Long.
9. X Destination hemisphere (E or W).
10. XXX.X Range to destination in nautical miles.
11. XXX.X Bearing to destination TRUE.
12. XXX.X closing velocity in knots.
13. X Arrival flag. (A = arrival, V = not arrival).
Sample sentence.
$GPRMB,A,00.00,L,1,2,5142.20,N,00217.10,W,048.8,304.0,090.0,V*18
Notes on the RMB sentence.
Note the direction in field 3 is direction to steer, i.e. off track to the right, steer left.
If not in NAV or DIRECT TO mode, the flag in field 1 will show invalid (V).
If in DIRECT TO mode there will be no start point identifier so field 4 will be blank (spaces). If in DIRECT
TO mode where the DIRECT TO point is just a point in space with no name, field 5 will be blank (spaces)
also.
The arrival flag in field 13 is set to A when the TP imminent message shows on screen and stay set until
the next leg is selected even if the TP passed message comes up on screen.
At the end of the flight plan or DIRECT TO when the unit drops out of NAV mode, the flag in field 1 will
change to a V.
The closing velocity in field 12 is the vectored velocity towards the waypoint. There is no provision for
showing negative numbers so if answer is negative, all zeros will be sent.
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