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Using A GPS with a Paper Map of the Southern Upland Way

I'm from the US and plan to hike the Southern Upland Way in April/May. I have the maps from Roger Smiths guide. After some research I think I understand the reference grid to find locations on the map. My question is how to set my GPS to display these coordinates or even if is possible to do. I have a Garmin Fortrex 301. This device is simple and can display locations, waypoints, speed and such but it does not display topographic maps. What position format and map datum should I set into the GPS to display the ordnance survey grid for location?

Jim Anchorage

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