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APB - Autopilot sentence data
$--APB,A,A,x.x,a,N,A,A,x.x,a,c--c,x.x,a,x.x,a,a*hh<CR><LF>
1. Status: A=Data varid V=LORAN-C blink or SNR warning
2. Status: A=OK or not used
3. Magnitude of XTE(cross-track-eror)
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. Bearing origin to destination, M/T
9. Destination waypoint ID
10. Bearing, present potition to destination, magnetic or true
11. Heading to steer to destination waypoint, magnetic or true
12. Mode indicator(see Note)
13. Checksum
NOTE Positioning system Mode indicator:
A = Autonomous mode
D = differential mode
S = Simulator mode
N = Data not valid
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+------------------------------------------------ 1
V=general warning flag for other navigation systems
when a reliable fix is not available
V=LORAN-C cycle lock warning flag
V=arrival circle not passed
V=perpendicular not entered
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+--+----------------- 10
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