four NMEA 0183 ports, one is galvanically isolated (2500 VRMS);
one SeaTalk port, can pair SeaTalk equipment with NMEA 0183 hardware or software;
allows control of SeaTalk autopilots from NMEA 0183 hardware or software;
a pair of routers can act as a SeaTalk or NMEA wireless extender and allows joining of two or more physical devices;
supports $STALK sentence of NMEA 0183 for raw SeaTalk datagrams.