I have an eTrex 20, Basecamp and £20 credit for Birdseye UK maps.
I can't select the map squares or area that I want because the base map is so poor, e.g. I want maps for the Lake District, but only one lake shows on the map and there's an awful lot of white wilderness. Having paid for mapping, Id like to be able to select what I want rather than relying on guesswork. Same story for Hadrian's Wall - good luck finding it on the base map.
Surely there must be some option to show a more detailed base map - with OS grids preferably? Am I just being dumb?