Using the nmea output from your GP-31 to the nmea input on the VHF. Enable the GLL Sentence and make sure the port is set for nmea0183. Remember hooking nmea up it's positive to positive and neg to neg. Once that is done and you have a fix you should have lat and long on your vhf.
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Using the nmea output from your GP-31 to the nmea input on the VHF. Enable the GLL Sentence and make sure the port is set for nmea0183. Remember hooking nmea up it's positive to positive and neg to neg. Once that is done and you have a fix you should have lat and long on your vhf.