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most are waterproof. I don't ever disconnect mine but have dielectric grease in the connection to help keep water out. but ive launched and landed in some nasty conditions and the finder has found its self under water more than once. I did have an issue with my current one shortly after a flip, but Lowrance replaced it with no questions asked since it was under warranty.
I think most have issues then whey are plugging in and unplugging and there is moisture in the vicinity. plus the action of inserting and removing the plug every time will reduce its ability to keep water out of the connection.
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