Lurking for the same advice...
garmin nuvi for the truck, easily updated. fm transmitter so you can tune to station and here it talk to you much better on truck stereo system. For 4 wheeler and snowmobile I use Lowrance h20 and mapping chip from navionics. Comes with mapcreate software that lets you define your area of interest and only those places you might be interested in knowing about, hopitals, restaurants, gas,etc