Regardless I have commonly started to fish the salt water after many years of bein land facetiously locked on the fresh water. Moreover I have no problem seeing fish on my Lowrance fish finder in fresh water, but when I go jiggin for Cod and Haddock I can't see any arcs ever though we are often catching fish. I don't have a dual freqeuncy transdducer but a friend of mine who is soberly showing me the ropes, does have one he still can't see them. We are both using auto mode and the default settings.