I'm not sure what you are going to be using the GPS for. Assuming you stick to roads, you can't really get lost like people do in the middle of dense forests or foggy mountains, where they go round in circles.
unfortunately (or fortunately depending on how you look at it) i'm heading into the wildest parts of the alps (i.e. middle of dense forest or foggy mountains) and so i can't rely on my usual spider-sense of direction and some luck!
in the end i opted to buy a Garmin eTrex Legend HCx which should do the trick.
thanks for the advice all.
gairy.