Hello,<br />What is the experience out there? The manufacturers say there is signal loss due to the hull, BUT the increased power of the "puck" more than makes up for it. I've got a 1980s 16' fiberglass Vanguard, with easy access to the inside of the hull. I'm not sure if it is solid fiberglass, or a wood/glass sandwich. I've contacted the mfgr to see (don't want to drill a hole to find out).<br /><br />I really like the idea of a completely concealed transducer for my depth sounder, BUT not at the cost of reliability.<br />With thanks,<br />Mike