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Can you get a decent reading without having water in the bottom of the hull? If so, this might be a really good way to go.
As a practical matter, most kayaks usually have a little water splashing around, at least mine does. If the transducer is mounted in a space where it is in the lowest part of the hull you should always have some water surrounding the unit. If the transducer is secured tightly to the hull, I suspect that not much water would be needed to make the thing work.
If the lowest place in the boat is not by something you can attach to such as the mast in your example, there is another easy way to strap a transducer to the hull so you can position it just about anywhere. I did this to secure my battery case below the rear hatch in my Revo.
Just take two plastic eyelets, (OEX has them), and goop them to the hull on either side of whatever you want to strap down. After the glue has cured, run some webbing with a cinch buckle through the eyelets and strap down the unit. You could also use some bungee material.
Bob
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