: Available on the Google Play Store , this app offers many features of a standalone GPS device for free, including grid positioning and route following.
To effectively use these free resources, remember these fundamental rules of contour lines: How to Make Printable Topo Maps for Free Topo Map Free
: A popular resource for cartographers and hikers alike, OpenTopoMap renders topographic maps based on OpenStreetMap data and SRTM elevation information. : Available on the Google Play Store ,
: National Geographic provides easy access to every USGS 7.5 minute topo map in the continental U.S. as a multi-page PDF formatted for letter-sized printers. as a multi-page PDF formatted for letter-sized printers
: This site is an excellent source for high-resolution topographic data, including LiDAR, provided by OpenTopography .
: While primarily satellite-based, you can view topographic contours in Google Earth by enabling terrain layers or using specific KML overlays. Essential Apps for Offline Use
: This is a premier tool for custom map making. The CalTopo website allows users to mix different layers, including updated USGS data and slope angle shading, which is vital for winter travel.