Open street map is great for hiking trails, particularly around urban areas where the US government maps (USFS, USGS) are way too out of date and don't cover ne

Open street map is great for hiking trails, particularly around urban areas where the US government maps (USFS, USGS) are way too out of date and don't cover new trails. I routinely update OSM for trails around the SF Bay area as I hike/bike them. I like the TF outdoors product accessible via the Caltopo and Gaia GPS apps, particularly the ability to easily download the maps for offline use.