"Roger Long" wrote
I've never seen three way switches for 12 V systems and you shouldn't use
110 volt non-marine stuff.

I don't see any reason why you couldn't take a couple of SPDT switches like
this and create JG's two station arrangement. Wire it like a typical 3-way
household light, substituting +/- DC for hot/neutral.
http://www.defender.com/product.jsp?path=-1|328|49758|303333|1017101&id=812735