The Airmar is available in NMEA 0183 and 2000 versions. Do you know which you bought? The Garmin 740 has both interfaces.
The fact it has bare wires suggests to me that it is 0183, as my DST800 in the NMEA2000 version came with a connector.
The fact it has bare wires suggests to me that it is 0183, as my DST800 in the NMEA2000 version came with a connector.