From Loch Lyon to Loch Tay, this the OL 48 map covers some of the most beautiful areas of the country. With many of the Monros, Tay Forest Park, part of Loch Lomond & The Trossachs National Park & a number of watersports areas, there's something for everyone who enjoys the outdoors. This map replaces the previous OS Explorer map 378 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 Ben Lawers & Glen Lyon is available in both the standard paper version & weatherproof ' Active' version.