[GPSNavX]

The starting waypoint of the route does not change because it can actually be a waypoint in a route. You will see this if you activate a route, then activate SailTimer and you will see the SailTimer route merge into the activated route.

You will notice the starting point of the active waypoint (layline) does change (the red dot).

Keep in mind the newly created SailTimer route is the layline to the destination waypoint (that is you do not want to sail past the line or you will have overstood - sailed too far)