My jeep wrangler has fantastic sounding overhead speakers, I was thinking maybe see if I could find some in a junk yard. I think they would fit in the Pioneer. And they are water proof.
As far as the GPS I took this evening and been researching them, the more I learn the more confused I get on what I want. I am leaning towards these trail tech voyagers but I would like to have "base camp" that some of the other ones have. I think I will wait to you get yours hooked up and see how you like it.
There are some lakes behind me here that I can see on the satellite photos that aren't even named, I can see trails into them I think I could find them with a GPS. Some of these lakes have fantastic trout fishing if you hit them at the right time.