Edit the routes in a file you open, not just view them. - Open any .gpx file and click the pencil button to start editing - Click the map to add a point. It joins the route at its nearest place, so you can refine the middle of a route, not only extend the end - Click any point to delete it - Undo the last edit with the button or Command-Z - Files with several tracks, segments or routes let you pick which one to edit; the rest stay visible while you work Your file is saved as standard GPX, with elevations, timestamps and names left intact.