i have built a new version of Trekker3D (3D maps Gps navigator).
This version create 3D maps from USA USGS maps (in the public domain) with a few clicks of mouse.
The terrain creator for Windows is free and can be downloaded at http://www.trekker3d.com
The App for Android is available on GooglePlay with a free lite version and a paid version:
free lite: https://play.google.com/store/apps/deta ... ker3d.lite