Horizontal dilution of precision (0..9999) (integer = actual hdop * 100)
Vertical dilution of precision (0..9999) (integer = actual vdop * 100)
Number of GNSS satellites used in solution (integer)
Always reads as 0, unused
NF No fix
DR Dead reckoning only solution
G2 Standalone 2D solution
G3 Standalone 3D solution
D2 Differential 2D solution
D3 Differential 3D solution
RK Combined GNSS + dead reckoning solution
TT Time only solution
Notes:
<rate> is a value between 1 and 2147483647 (2
31
-1). It will be the number of seconds in
between each message. If <rate> is 0, no messages will be sent.
If <rate> is valid, no $GS messages will be sent by the device until the GPS has obtained a
valid position reference as indicated by the $M138 POSITION*2d message .
November 2021 Swarm M138 Modem Manual - Rev 1.00 50/77
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