OpenTopoMap (an OpenStreetMap service) showing my GPS track from backpacking in the Flat Tops Wilderness in 2016 . It is zoomed into the busiest entry point where one very excellent and well used trail is missing. The map in question is, of course, OpenStreetMap . While not explicitly setting out to do this, they've created the Wikipedia of maps and you probably use it even if you don't know it. It's on AllTrails and Strava and behind Gaia Topo and MapBuilder on Caltopo. If any of those have an error, you can fix it. There in the lower right hand corner on AllTrails is the attribution and an invitation to change and add to the map. It's not just on the internet. This is also the one electronic map I carry with me, offline , that I know it will cover the place I am. When I need a library, post office, grocery store, gas station, I can search and find it even if I haven't got any usable cell signal. The roads are (generally) there. The buildin
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