There is a lot of engine noise so you can't hear me explain this device that tells us the water temp and the speed the boat is going.  Right now the water temp is 63 and the speed is 7 mph. The device is put into a hole in the bottom of the boat, screwed down and spins to give us the information.  Yes, when I get it out of the hole water sprays into the boat and goes into the bilge (bottom of the boat) where it is pumped out by the bilge pump.   I think videos are better than pix.