Explore Great Britain's national parks and trails with detailed topographic and road maps. Garmin GB Discoverer National Parks & Trails contains topographic maps from Ordnance Survey of Great Britain including OS Explorer Map as detailed as 1:25,000 scale and 1:50,000 scale Landranger maps for one region of the country. With NAVTEQ road data and points of interest for all of Great Britain, you'll Explore Great Britain's national parks and trails with detailed topographic and road maps. Garmin GB Discoverer National Parks & Trails contains topographic maps from Ordnance Survey of Great Britain including OS Explorer Map as detailed as 1:25,000 scale and 1:50,000 scale Landranger maps for one region of the country. With NAVTEQ road data and points of interest for all of Great Britain, you'll ... More Details! Garmin GB Discoverer 2010 New Forest/South Downs Topographical Map microSD Card , Lowest Price for Garmin GB Discoverer 2010 New Forest/South Downs Topographical Map microSD Card , Garmin GB Discoverer 2010 New Forest/South Downs Topographical Map microSD Card For Sale.