Starboard is a "marine hardboard" which is workable like plywood, and is usually what the carpeted "sidewalls" under your console are made of, and also used often for flooring material (and sometimes for boat construction covered in fiberglass for stringers and such).
Anyhow, simpler and cheaper and much easier to find, go buy a cheap white cutting board from any store (as thin as you can find/want), and simply cut out the same sized "puck" as will cover the area you need. Marine silicon it in place and done.
I recently upgraded my sonar to a much larger unit, and after pulling off the smaller old bracket (bought boat used) found a mess of previous holes from multiple installations.
Made a cutting board "template" shaped to fit over the holes as well as shaped to follow the lines of the boat in that area, bolted the new bracket to the cutting board from underneath (bolt heads countersunk into board), placed board flush to the boat and used several of the existing holes to bolt the board/bracket combo into place.
This combo looks great, and is rock solid, (actually feels stronger than the previous bracket, probably because the "plate" covers a large area now not just directly under the bracket) (and it served double duty, I actually doubled the board under the bracket area to give the sonar clearance over the windshield that it needed to allow tilting).
Oh <edit>, my boat is white, so if your boat isn't white, match accordingly if you can (but the GPS puck was probably white, so it won't be any worse, LOL)
Edited by ChrisTexan (02/10/12 03:52 PM)
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