One of the most important things is a dedicated power wire going to the garmin to prevent voltage drop. Mine is a 10/2. It needs to be on the crank battery and as far away from the TM leads as possible. I also have a ferrite ring on the transducer. You can get them pretty cheap from Amazon and it helps with EMI. There's a guy in Rogersville that specializes in boat instalation. His name is Rob and his business is FBI....Fishing Boat Installation.... He spent several years working for a company that maps our rivers and he is really good with all brands. Last Fall I paid for his service to ride with me to teach me a few things. When the sun comes up I'll check my settings on the unit but each river is different depending on its clarity.

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