NMEA0183 has been hard to kill, and is still a feature in most versions of marine electronics. But NMEA2000 (NMEA2K) has become THE network, so perhaps it would be an idea to make sure the live mapping could be used with NMEA2000?
I for one already have a working NMEA2000-network, and this again can be connected to a laptop with an adapter. No need to make my own connectors and cables.