1 - Click in the map to add a waypoint.
2 - Click and drag w/p to change poition.
3 - Double click on w/p to delete it.
4 - Click on a line to add an intermediate w/p.
5 - Give your route a name, (top-left) default is "gpswpts".
6 - .gpx button will download the file.
7 - WP button will toggle / hide waypoints.
8 - Refresh. - Start again.
9 - Definitive Maps.
10 - World / UK Maps.