Using a Humminbird transducer with Ardupilot

How can I get data from a 7-pin Humminbird transducer into Ardupilot telemetry? On this page, it describes how an analog transducer connects but I’m not sure if the Humminbird is the same. I’m just looking to record depth and location to import into ReefMaster or ArcGIS.

have you got a clue ?