So if you have a helix 12 gen 2 and have the mega transducer picked but are running a high def transducer you will have a fuzzy screen. Fought it for a week before I figured it out. Adjusted all the settings prob twenty times before I remembered somebody talking about having the wrong transducer picked. Also learned from humminbird that if I buy the mega transducer it will make my unit a mega. But just don't see where I need it she's clear as a bell now.