Garmin Garmis GPS Smart Antenna GP35-LVC - Manual (Page 21)

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4) $PGRMO,GPALM,1 will cause the sensor board to transmit all stored almanac information. All
other NMEA sentence transmission will be temporarily suspended.
4.1.6 Tune DGPS Beacon Receiver (PSLIB)
The $PSLIB sentence provides the ability to tune a GARMIN GBR-21 or equivalent beacon receiver.
$PSLIB,<1>,<2>*hh<CR><LF>
<1> Beacon tune frequency, 0.0, 283.5 – 325.0 kHz in 0.5 kHz steps
<2> Beacon bit rate, 0, 25, 50, 100, or 200 bps
If valid data is received, the GPS 35LP will store it in the EEPROM and echo the PSLIB command to the
beacon receiver. At power up or external reset, any stored frequency other than 0.0 causes the GPS
35LP to tune the beacon receiver.