Topographic Maps from GPS Tracks

The maps on this site have been obtained using the excellent gmap4 service.  To obtain a map, all you need to do is form an URL which asks gmap4 to produce a map using a given GPX file, as in

The parameter t indicates the type of map (Google Terrain, USGS Topo, etc); I recommend t=t4, which are high-resolution topo maps with shading.

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