Quoting from the site:

GPS Visualizer: Do-It-Yourself Mapping

GPS Visualizer is a free, easy-to-use online utility that creates maps and profiles from GPS data (tracks and waypoints, including GPX files), street addresses, or simple coordinates. Use it to see where you've been, plan where you're going, or visualize geographic data (business locations, scientific observations, events, customers, real estate, geotagged photos, "GPS drawing," etc.).

The site allows you to quickly make topographic map overlays and add range circles to Google Earth and a lot more.