Remember the golden rule!
Go forward with a map & compass, go back with a GPS.
That way, you are using waypoints that have been logged by your machine, to real points on your route.
As far as buying is concerned, go cheap and cheerful (I also recommend Ebay). If you can enter waypoints and go to them - it's enough. Don't bother with map versions, you don't need them (if you are on this forum, you will fall off the installed maps anyway). Lat/long and a good map is all you need.
Sam.
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