I bought a new Helix mega SI G2N last Fall. Got a chance to run it through the paces a few times this Spring finally. I like it except for one thing. On plane the depth reads 425 ft or some random number. I read about a 2nd old school transducer and a splitter wire. I believe I read that this works on fiberglass boats w/ shoot through the hull transducers. I have a Crestliner aluminum bass hawk. Would this work? I know most of the lakes I fish, but when I go to Canada or a new lake I don’t want to strictly rely on the Lakemaster chip. Any thoughts would be appreciated, Sam