So i was out riding my boat in the tennessee river. Me and a buddy found a cave and figured we would drop anchor and explore it a little. When we were ready to leave we turned the boat around by hand (all the while with the outboard turned up to avoid prop or LU damage from shallows) when it happened. BANG!. He had moved the boat too far in one direction and smashed the aft-starboard side against a rock and shattered my speedometer pickup (the little plastic peice in the water). My question is....What is the technical term for these and how expensive are they.