Gents ... this has probably been answered elsewhere ... but I have a Terrova 80 w/ Mega DI transducer ... and a HELIX 10 CHIRP MEGA SI+ GPS G3N ...
at the bow on my 18 ft pontoon ... I want to be able to get the Mega DI from the 'ducer in the Terrova and be able to get SI from the transducer on the stern.

What do I need to rig that up?