Many route planner applications and GPS devices track routes into GPX files. GPX stands for GPS eXchange. (Read more about the GPX format at Wikipedia.)
If you take a walk or any other kind of route outside with your GPS device and want to share your route afterwards, RouteView is a handy tool.
Load a .gpx file and share it with others. When you share a route, a snap shot of the route map will be sent along with the data, via email or iMessage.