This can be far more complicated than the examples above, as well.
Have a few waypoints to get out of port. Then say waypoints 5 through 20 get you to the destination port. Make waypoint 21 all the way back next to waypoint 5. Have 22 through 50 be an alternate route to the same destination. 51 goes back next to 5. 52 through 75 are an alternate route to destination. 76-80 gets you to destination port.
Setwaypoint 4 to loop to 21 a % of the time. Waypoint 5 loops to 51. Waypoints 20, 50, and 75 all have 100% loops to 76.
You now have 3 different routes to waypoint 76, and from there to port.
tater
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