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not sure what software you have but if you open the .gpx with a Garmin Mapsource product (I have Metro Guide US) and doduble click in the pane on the left side to open the track properties, You can highlight points, show on map to isolate the points in question and delete. I have done it many times. If you need more specific help I may be able to assist you. I use a Legend when I ride but often save my tracks as a .gpx to inport into sport tracks.