I think you can use a smal trick to get the correct canal pas:
1 go to nav map and select the waypoint tool
2 Make 1 waypoint in the sub pen (normal startposition very important)
3 select the kanal out waypoint generator
4 delete the waypoints you don''t need (waypoint in the subpen)
5 follow the waypoints ...
This should work I did use it in GWX2.0 several times.
Please post if it doesn't cause I haven't been playing for a while due to PC problems