Here in the Mississippi swamps, I just use my cell phone and Google Earth. Out of state, I use a Garmin Etrex. On several occasions it has saved me many steps. Problem is, each year I have to reaquaint myself with the Garmin,'cause I'm an old coot who can't remember what I had for lunch, much less how to navigate my way around all the different applications on the GPS that I haven't used since last season. When I upgrade (probably next year) it will be for a new Garmin basic unit with no "new stuff" to learn.
Maybe the best insurance from not being able to find your truck would be to buy snakeboots with a distinctive tread, so yoiu could always just backtrack!
Tom