In reply to Peris Roberts:
What do you want it to do ? The more features you want the more pricy they become. And some will say a phone ( in a waterproof case ) can do it all these days ( especially if your phone has a removable battery, ie you can carry spares, ie not an iPhone )
- do you just want a grid ref ?
- do you want to be able to set up a route in advance with various waypoints and let the GPS guide you around the route ?
- do you want to be able to load OS ( or equivalent in another country ) maps onto it, ie a large colour screen ?
etc, etc
It's a few years since I bought mine, after having had a Garmin eTrex I sold it and got a Satmap - the Satmap was so much easier to use than the Garmin who's menu system was very confusing, but Garmin may well have updated their user interface since then.
Satmap also has nice big buttons, easy to use with winter gloves.