FYI fellas, the 20/60 degree transducer is great for shallow water, but for lake trout in 100 feet, its pretty crapty. You cannot use a narrow cone transducer unless you have a NON DOWN IMAGING machine. I've checked this out twice and it sucks because I have a down imaging unit. Looking for a cheap 597 ci HD if anyone is getting rid of one. PM me if you do.