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54 Magellan GPS 315/GPS 320
VTG Actual Track and Ground Speed (SPD)
1 2 3 4 5 6 7 8
VTG,XXX.,T,XXX.,M,XX.X,N,XX.X,K
1-2 Track degrees, True
3-4 Track degrees, Magnetic
5-6 Speed, knots
7-8 Speed, kilometers/hour
XTE Cross Track Error
1 2 3 4 5
XTE, A,A,X.XX, L,N
1 Or’ed value Blink and SNR (A=Valid, V=Invalid)
2 Cycle Lock, (A=Valid, V=Invalid)
3 Cross Track Error
4 Steer Left of Right (L = Left, R = Right)
5 Units (N.Mi.)
NMEA 0183 VERSION 2.1
APB Autopilot Sentence “B”
1 2 3 4 5 6 7 8 9 10 11 12 13 14
APB,A,A,x.x,a,N,A,A,x.x,a,c—c,x.x,a,x.x,a*hh
1 Status:
A = Data valid
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