GPXSee/pkg/maps/USGS-topo.xml

<?xml version="1.0" encoding="UTF-8"?>
<map>
	<name>USGS Topo</name>
	<url>https://navigator.er.usgs.gov/tiles/tcr.cgi/$z/$x/$y.png</url>
	<zoom min="2" max="15"/>
	<copyright>Map services and data available from U.S. Geological Survey, National Geospatial Program.</copyright>
</map>