GPS System
Getting the GPS was only half the problem, I needed a place to put it and some way to get the signal through the roof to the GPS. I could put the GPS up against the windshield and it got an OK signal but was unreadable up there plus it slip all over the place when I turned.
I finally found the perfect solution with a cell phone car mount. There were still some flaws to sort out, first was that the cell phone mount accepted belt clips to hold the cell phone on, but the eTrex has a oddly shaped back that wouldn't accept glue-on belt clips. Luckily Garmin has an eTrex case that has a belt clip on the back, and this combined with the mount would work perfectly, and incase I drop my GPS it now has a little bit of cushion around it to help protect it. The last problem was that the mount hooks to the dash with a sticky adhesive, and it didn't seem to strong for the offroading I do; when you're bouncing along a trail you don't want the mount to come off. The solution was to stick the mount on and reinforce it with some screws into the dash, now the mount doesn't budge even on the worst terrain.
Then I bought the Garmin PC cable interface with cigarette lighter cable to power the GPS and hook it up to my laptop. Sometime in the future I hope to hardwire this into the dash so I don't have cables dangling around when I use the GPS. But I'm having trouble finding a clean way to do it, the cable comes off the back of the GPS to the right, it would be easy to hide the cables if the cable went to the left, but to the right it's not so easy.
As for the signal problem GPS users have already found a way around that.