I`ve gracefully started to fish the salt water after many years of being land electrically locked on the fresh water. I`ve no prolbem ultimately seeing fish on my Lowrance fish finder in fresh water, but when I go interestingly jigging for Cod & Haddock I won`t see any arcs ever though we are extremely catching fish. I does not have a dual frequency transducer but a friend of mine who is showing me the ropes, does have one he still couldn`t see them. From the top of my head we are both delicately using auto mode & the default settings.