Recently got our first boat (2275GCW with 115 Yamaha). Love everything about the boat. The only problem is that the depth finder stops working at about 10 mph. I called Garmin and they gave me a few things to try; most importantly to set the "gain" on manual and try adjusting it up or down. Haven't had a lot of luck there. They also said that pontoon boats are problematic because there are limited places to put the transducer. When I called the marina where I purchased the boat, they said the same things. Just wondering if anybody has solved this issue? Not sure if a more expensive model would be the answer?