I like using ridewithgps, which is obviously designed for cycle route mapping, but it has various map overlays, and the OS Outdoor map is really handy for highlighting footpaths, particularly named routes like the Green Chain Walk, Capital Ring, etc.
I like using ridewithgps, which is obviously designed for cycle route mapping, but it has various map overlays, and the OS Outdoor map is really handy for highlighting footpaths, particularly named routes like the Green Chain Walk, Capital Ring, etc.