Never heard of what you described.
The AS HHGPS is a cable to connect a handheld GPS unit or AIS to a Humminbird, that is what the description states.
https://www.humminbird.com/sites/humminbird_site/files/hum_productmanual_ig_ais_helix_532458_0.pdfThe original 360 in all three versions--transom, Fortrex, and Ultrex comes with the
AS GPS HS puck.
It is included so you can MARK and DISPLAY waypoints on the 360 view.
That puck is still a current accessory and not included with the MEGA 360 but is needed for the same purpose as with the original 360.
Minnkota has a puck that is a Heading Sensor only and has Minnkota on top of it. It talks to the Minnkota iPilot via Bluetooth. AND can be shared to a Humminbird unit IF the iPilot is the LINK version and the Ethernet cable is attached between the iPilot and Helix.