Personally, I would not mount a transducer through the hull of my kayak, but thats my opinion.
2 reasons.
The picture I get with the transducer mounted inside the hull using slow cure epoxy is very good, better than my last application using marine goop.
The second is the possibility of a leak developing while I was offshore, or anywhere else for that matter. Your kayak will flex with use even in calmer waters.
I don't make holes below the waterline.
2 cents.
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