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HI Doug, sorry for the delay. You can mount the transducer pretty much where it will fit best, ***** ***** center on the boat for a better reading related to your keel. Make sure there is nothing protruding from the hull like a vent or water pickup directly in front of the transducer, so water going by it will not be disturbed. Mount it slightly above the hull line 1/4 to 1/2 inch above the bottom will be fine.