eagle cuda-cheap as chips
works on our ribs flat out with no problems
. dont bother hanging the transducer on the back of the transom where it can get damaged just dry out the drain well and stick the transducer down with a thin layer of silicone sealant (twist it round a bit to clear any air bubbles) and it'll work fine. Trial it first if ya want by putting some water in the well and just drop the transducer in there with its face down onto the glass. as long as there is water in there to cover it then it will work.