Covering part of the Cairngorms National Park, & including ten of the Munros OS Explorer Map OL 51 is a rugged area with few roads or marked paths. This map replaces the previous OS Explorer map 394 for this area. Take the time to explore, & you can find some of the most stunning landscapes in Great Britain. With this map you will receive a code for use on your i OS or Android smartphone or tablet. Find our more at Mobile Download FAQ. The OS Explorer map for Atholl is available in both the standard paper version & weatherproof ' Active' version.