Furuno INMARSAT-C MOBILE EARTH STATION FELCOM 12 - Manual (Page 172)

AP-18
Data sentences
Input sentences
BWC - Bearing and distance to waypoint
$--BWC, hhmmss.ss, llll.ll, a yyyyy.yy, a, x.x, T, x.x, M, x.x, N, c--c, a*hh<CR><LF>
Checksum
Mode indicator
(see note 1)
Waypoint ID*
Distance, nautical miles
Bearing, degrees true
Waypoint longitude, E/W*
Bearing, degrees magnetic*
Waypoint latitude, N/S*
UTC of observation*
NOTE 1: Positioning system Mode indicator:
A = Autonomous
D = Differential
E = Estimated (dead reckoning)
M = Manual input
S = Simulator
N = Data not valid
The Mode indicator field shall not be a null field.
*: Not used