The eastern side of the Cairngorms National Park, the River don & the eastern Grampians are covered by OS Explorer Map OL 59 There are a number of peaks surrounding Strathdon to explore, including Mona Gowan (749 m) & Carn Mor (578 m). This map replaces the previous OS Explorer map 405 for this area. 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 Aboyne, Alford & Strathdon is available in both the standard paper version & weatherproof ' Active' version.