The Humminbird Matrix family of Fish Finders all feature an NMEA0183 Output but you need to have the AS-HHGPS cable kit (P/No. 700030-1) that connects to the rear of the unit. This cable kit is available as an optional accessory.
A wiring diagram that shows how to connect the AS-HHGPS cable kit to the Sonar Server can be seen by clicking here.
Make sure that the NMEA Output is set to ON in the Advanced Setup menu of the Humminbird Matrix unit.