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C NMEA-0183 Messages
90 AgGPS 332 GPS Receiver User Guide
C.10MSS (Beacon Receiver Signal Status)
The MSS message identifies the status of the beacon signal, including
the beacon signal strength, beacon signal-to-noise ratio (SNR), beacon
frequency, and beacon bit rate.
The MSS message structure is:
$GPMSS,52.5,23.7,287.0,100*4C
Table C.10 describes these fields.
Note – Because the contents of this NMEA message do not change
significantly during a one-second interval, the receiver outputs this
message at a maximum rate of 1 Hz.
Table C.10 MSS message fields
Field Description
1 Signal strength (SS), dB ref: 1 υV/m
2 Signal-to-Noise Ratio (SNR), dB
3 Beacon frequency, 283.5–325.0 kHz
4 Beacon bit rate (25, 50, 100, 200), bits per second
5 Channel number