I have had a number of questions from readers about how to get some certain trail data onto their GPS. That answer is complicated, because it depends on the trail data and it depends on the GPS you have. If the trail data you want to use is a simple track from someone’s previous ride, you can load it directly onto your GPS. Fitness GPS receivers (like the Edge models with mapping) can do a Virtual Partner based on that file and do performance comparisons and whatnot. With a mapping handheld, you get a basic navigation (it warns you if you deviate from the trail, but not much more). If that .gpx track has more track points than your GPS receiver’s track point limit, you have to reduce the number of points in the track by simplifying it (some programs allow you to do this) or by converting it to a route, which will prompt you to turn (best used on roads where turns occur at intersections, than on trails where turns often occur dependent on terrain).