In reply to llanberis36:
Basic etrex 10 yellow recent version, not the old one as the newer one is easier to operate & more cold resistant!
I use mine as a back up...however I have memory map 1:25K mapping on computer at home, so I create waypoints/marks on main hills, & nav points all on the MM 1:25K... plug GPS to computer & transfer these points over
I print off A4 at 1:25K or 1:50K the area I will be walking which includes the waypoint/marks on the map & put those A4 sheets into an A4 ortlieb clear mapcase.
I set GPS to track on least often setting. I use map & compass for primary nav. If in doubt I look at GPS which does not show OS mapping, but shows the waypoints I created & current track all in relation to each other as if map.
Making waypoints at home is best as doing infield is a nightmare in winter, also having same on map print out..all info is across the lot, no need to cross check..
Of just buy very expensive OS mapping on fancy GPS Memory map do some which will show you real time where you are on a nice touch screen with OS mapping..
I do have my MM OS 1:25K also on my ipad mini which has A-GPS built in (via mobile signals)....in the car quite good, I would take on hill though as not true GPS & cold proof enough for winter