I can help you out very inexpensively. I've done several of exactly that type of integration before both for myself and for several of my friends, as well as in the Amateur Radio
community with GPS/radio integration.
If you'd rather pay someone a lot of money
to do it, I've heard the folks at Y.E.S. are pretty good.
I'm a degreed Electrical Engineer
, an Amateur Radio
operator (Extra class), and a fellow sailor, but I am not a "licensed, bonded, or insured" installer, so, caveat emptor.