[pamarine]

The transducer would pick up throught the hull of a plastic kayak, although with worse degradation of signal due to PE being denser than most FRP, because PE kayaks are a single hull. However, the Triumph hull has a considerable amount of air-trapping flotation foam that would interrupt a transducer beam. In order to mount a transducer in the hull of a Triumph, one would have to either find a spot where the inner and outer hulls were bonded directly together and was large enough to properly mount the in-hull mounting flange, or mount the transducer through the hull of the boat, which brings us back to the warranty issue among other things. Hope this helps