on 28 November 2013
The best since ~1853
These maps are called OL because that is what you say when you realise you need to buy another one for a small area not covered by the one you have! Only joking. The Ordnance Survey have always done a remarkable job in keeping the British mainland mapped in great detail and up to date. I doubt you will find another country in the world that have small scale features such as sheep folds and tumulus highlighted on the map. It is this kind of detail that is essential out on the hill or mountain in remote areas to accurately navigate sans GPS. On this point I would say that I am technology agnostic, that is to say I use GPS BUT I do not rely on it alone and can easily revert to map and compass should GPS fail(and indeed it has several times). With regards to the waterproof 'Active' maps it comes down to personal choice, some people swear by them others prefer paper. I always use paper maps and a waterproof case, this is because in my experience the 'Active' maps are a bit bulky/cumbersome and impossible to use in strong winds. Finally I would also recommend Harvey Mountain area maps as they are fantastic for route planning and also getting the shape(Topology) of the ground and features really quickly due to contour shading.
on 18 April 2011
What can you say? It's an OS map... the best. Double sided, with the Howgills on one side, and the area immediately north of them (the upper Eden valley) on the other. The latest standard of 1:25 000 mapping, dated 2008.