NMEA-0183 message: MSS

The NMEA MSS message is supported by Trimble receivers capable of MSK (Beacon) reception.

Signal-to-noise ratio, signal strength, frequency, and bit rate from a MSK (Beacon) receiver

The format of the MSS message is:

$‐‐MSS, x.x,x.x,x.x,x.x,x*hh<CR><LF>

An example of the MSS message from a dual‐channel DGNSS receiver is:

$GPMSS,26.4,7.2,283.5,200,2*61

MSS message fields

Field Meaning
0 Message ID $--MSS
1 Signal strength (SS), dB re: 1 uV/m
2 Signal-to-noise ratio (SNR), dB
3 Beacon frequency, 283.5 to 325.0 kHz
4 Beacon bit rate (25, 50, 100, 200) bits per second
5 Channel number (set equal to "1" or null for single-channel receivers)
6 The checksum data, always begins with *