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Not sure if any of you use OS Maps when trail running, but above and beyond have 35% of the range. Making the Explorers £5.19 each very cheap! http://www.aboveandbeyond.co.uk/OS+Maps/list/f1
Brilliant prices - perhaps a good investment considering the predicted solar storm might wipe out all gps devices...
GPS is all well & good, but there's nothing like having an OS map to study!
I've gone digital. i love OS maps, could stare at them all day.