Reviewed by James - 27th Aug, 2020 Useless for Explorer maps Whatever it may say, this is only useful for 1:50,000 scale Landranger maps, and essentially useless for Explorer1:25,000 maps. If you want to be able to measure your walks on Explorer maps, this is just plastic tat.
Reviewed by Fred - 3rd Feb, 2016 Does not work on 1:25 000 scale Purchased one of these today and cannot see how it works on a 2.5 inches to 1 mile map. It will be going back tomorrow!