Topo Reader App
Full Resolution Topography Maps of U.S.A.

Note: The Topo Reader app is now the Topo Nomad app (Sep 18 '18).


Download and install from over a quarter million U.S. Geological Survey maps for GPS use offline and without need for cellular service.


Topo Reader is an iOS app that displays US Geological Survey topographic maps of the USA for offline and GPS use. It concurrently downloads maps in the background why you use it. Easily locate destinations and install the desired quadrangles. Automatically installs the map for your current location. Vacations and road trips around North America makes this app truly priceless.

User Manual

Topo Reader ©2014-2018 Delcartes LLC all rights reserved.