When I had my Hummingbird, I was able to silicone it to the transom, it had a nice flat surface. The Garmin trans. doesn't stay on due to the finned shape of the mount. I was thinking of siliconing starboard to transom but I'm told it won't stick. I don't want to perm. mount this thing until I know exactly where it needs to be. I had alot of problems with loosing the signal on my Hummingbird when under way.
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