My boat came with what appears to be factory installed Hummingbird Wide Eye fish finder on the front with a trolling motor mounted transducer. The unit itself will power up and display fine, but it won't come out of Simulator mode for some reason. I guess this means i should replace it (??) cause i think these units are old anyways. Are Hummingbird fish finders any good? I'd like to stick with something that could possibly use the same transducer and hummingbird gunwale mount if possible to ease the pain of refishing wires and remounting another bracket in it's place. Yesterday was the first time i've ever used a fish finder (got another one on the dash) so i'm totally new to these gizmos anyways. Any way to tell if it's the unit or the transducer that's bad?