Global Mapper is more than just a viewer capable of displaying the most popular raster, elevation, and vector datasets. It converts, edits, prints, tracks GPS, and allows you to utilize GIS functionality on your datasets in one low cost and easy to use software package. Global Mapper also includes the ability to directly access the entire TerraServer database of USGS satellite imagery and topographic maps free of charge and to view elevation data in true 3D with any loaded raster imagery and vector data draped on top of it!