I Recently purchased a 2002 Reinell. It has a depth sounder installed But I don't know if it is original or aftermarket. (picture attached). It seems like all the functions work properly but it does not give me a depth reading. I looked around the transom and all under the boat for a transducer. I did not find one nor did i find any penetrations. Can it be located inside the hull? and where would it be? front, back, mid??? Thanks