Editing GPX waypoints on Rider 450
If I have set up a track on Tyre and imported the route as a GPX file, how do I get back on track if I am diverted away from the planned route (by say, a diversion for roadworks) and a waypoint becomes inaccessible as a result. The satnav keeps telling me to go back to that redundant waypoint. Can I delete that waypoint ? It was possible to edit the route on the 550, but I can't find that facility on the 450!