GPSMap66s and 66st - Using the new feature in the Topo Pro OS Maps of Route-able Trail Data within the National Parks to navigate to a point using Turn by Turn Routing on footpaths - Log into online resource > Courses > Garmin - Units > GPSMap66s and 66st > Using the new feature in the Topo Pro OS Maps of Route-able Trail Data within the National Parks to navigate to a point using Turn by Turn Routing on footpaths