Thought of placing it in an enclosure like one of these:
http://www.jpwmarine.com.au/products...hatch-wht.aspx
I mounted something similar on my quintrex for my Alpine unit and then bought a wireless remote and placed that on the drivers side.
If you can be bothered making a custom enclosure out of starboard that would also work.
Plenty of threads on THT indicate that an enclosure to keep the spray off the unit does wonders to extend the life of the unit.