Does anyone know if it is possible to mount a Hummingbird 525 transducer on the inside of the canoe (on floor) and make it work?  My canoe is the plastic polymer type.  I was thinking if does work I could epoxy the transducer in place and then I would be able to see the under water structure in some small lakes that I fish.  Small lakes that don't allow motors on boats.

Thanks for your help.

It is easy to check. Just put some water inside and place the transducer in the water with some weight on it. If it gets a clear signal return, then you can expoxy it in. The canoe material may have too many air bubbles in it for optimal signal transfer.