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NMEA 0183 VERSION 2.1
APB
Autopilot Sentence "B"
1 2 3
4 5 6 7 8
APB,A,A,x.x,a,N,A,A,x.x,a,c—c,x.x,a,x.x,a*hh
Status: A = Data valid
1
V = Loran-C Blink or SNR warning
V = general warning flag for other
navigation systems when a
reliable fix is not available.
2
Status: V = Loran-C cycle lock warning flag
A = OK or not used
3
Magnitude of XTE
4
Direction to steer (L, R)
5
XTE units, nautical miles
6
Status:
A = arrival circle entered
7
Status:
A = perpendicular passed at waypoint
8-9
Bearing origin to destination, M/T
10
Destination waypoint ID
11-12 Bearing, present position to destination,
Magnetic or True
13-14 Heading to steer to destination waypoint,
Magnetic or
True
9 10
11 12 13
14
35
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