I own a 1987 Ericson 34 and am considering buying a Garmin GPS/Chartplotter that can also be attached to an in-hull (shoot thru hull) transducer for on-screen depth readings. Does anyone have any experience or knowledge if this will work ok? Information says that it will work as long as the hull is not cored. I don't believe the hull is cored but it is quite thick so am concerned whether the transducer will function if glued to the inside of the hull. I'd rather not drill another hole thru the hull. The original depth sounder is on the boat but it only reads to 200 feet and there are times I would like to know deeper depths as well as have a back-up depth sounder.