Trimble Outdoors 132 - Manual (Page 118)

C NMEA-0183 Messages
11 8 DSM 132/132RS Receiver User Guide
11 Direction of magnetic variation
E: Easterly variation from True course (subtracts from True
course)
W: Westerly variation from True course (adds to True course)
12 Mode indication
A: Autonomous
D: Differential
N: Data not valid
Table C.13 RMC message fields (continued)
Field Description