Map number 50 in the OS Landranger map series is the ideal map to use when exploring the area from the North of Loch Fyne to Black Mount. This map covers part of Loch Lomond & The Trossachs National Park as well as a section of the West highland way through Glen Orchy & Loch Etvie to the west. 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 Landranger map for Glen Orchy & Loch Etive is available in both the standard paper version & weatherproof " Active" version.