Welcome to Outfitting
To mount a depth finder vertically on the hull, find the most accessible location you can forward of the keel and after pulling the boat, use a hole saw to drill your hole. Measure with a protractor the angle of the hull, immediately both for and aft of the hole. Prepare a mounting block from a large piece of mahogony (available from custom woodworking supply houses or a local boat yard) by first drilling it for your sender then cutting horizontally across it to match the hull''s angle at the mount point. Don''t worry if you''re off a little. Keep the top piece, as it is a mirror to the inside hull. Use 3M 4200 or 5200 (if you never intend to remove it) for mounting.