[GPSNavX]

As noted above you cannot use the same port as the repeat port and then receive AIS NMEA data on it. You would need a second UBS to serial adapter to receive AIS. You would then select the port of the second adapter in the AIS panel Settings drawer, rate 38,400.

Also note: you will not see AIS NMEA data (!AIVDM sentence) until you actually receive AIS targets. So your AIS receiver will need to be powered on and have an antenna connected.