XNT-9-DI-T currently installed on boat.
Would connecting my Helix 9x Sonar GPS (2D-only model) to this fry the head unit or would simply use the 2d portion of the transducer?
Humminbird compatibility chart says not compatible.
Looking at the pinout diagrams, it shows the DI pin separate, other pins same as 2D.
Just trying to avoid a transducer swap if possible.