Garmin GB Discoverer Loch Lomond & The Trossachs Map Preprogrammed Datacard Description: Navigate with Ordnance Survey mapping on your Garmin GPS. Available in 1:25K scale maps with detailed topographic data including terrain contours, topo elevations, summits, paths, routable roads & geographical points. Turn-by-turn navigation anywhere in Great Britain is made possible with integrated street maps, included on all Garmin GB Discoverer products. Search, select & navigate to street addresses & attractions & follow routes on foot, in car or by bike using the familiar Ordnance Survey backdrop.