GaiaGPS is my my app of choice when hiking, kayaking, and exploring the outdoors in general. I will look at AllTrails for trail descriptions and reviews but on the trail I am always on Gaia.
Two built-in maps that I recommend are the 1900 and 1940 USGS Topo Maps! It’s very cool to look back in time wherever you are.
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This useful list of free map servers from Tim Smith at TrailNotes.org. Check out his other cool mapping software while you’re there.
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Bing Maps can be added with a free Bing Maps developer key using this free tool by Nathan Cahill
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This is a large list of free map sources courtsey of Brendan on the Rokslide forums:
Data Sources: ESRI Worldview: https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x} Stamen Terrain: https://tile.stamen.com/terrain/{z}/{x}/{y}.png Stamen Watercolor: https://tile.stamen.com/watercolor/{z}/{x}/{y}.jpg Strava All: https://heatmap-external-b.strava.com/tiles/all/bluered/{z}/{x}/{y}.png ESRI National Geographic: https://services.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer/tile/{z}/{y}/{x} Google Maps: https://mt1.google.com/vt/lyrs=m&x={x}&y={y}&z={z} Google Terrain: https://mt1.google.com/vt/lyrics=t&x={x}&y={y}&z={z} Google Terrain Hybrid: https://mt1.google.com/vt/lyrs=p&x={x}&y={y}&z={z} Google Satellite Hybrid: https://mt1.google.com/vt/lyrs=y&x={x}&y={y}&z={z}
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