The following files are georeferenced jpegs, for use with globalmapper (www.globalmapper.com) A complete set of files consists of : image.jpg = jpeg of area of interest image.JGW = world file for image.jpg image.prj = projection file for image.jpg If loaded into globalmapper, these imagery files are properly located on the world grid. Globalmapper can further be used with a gps to plot positions in real time using the above imagery.