I installed a dual spectrum shoot thru hull transducer in my boat. When I get on plane, I lose my 2d sonar. I want to know how do I know my unit is using the shoot thru hull transducer. There isn't a transducer select option like the Helixes. Just the sonar source option. Networked with a Solix on the bow. If the dual spectrum transducer wasn't connected, would Full Chirp be an option? Or would it not be there if that transducer wasn't connected?