We are using DD to inspect water windmills on a very large cattle ranch. All the windmills are exactly the same. We want to repeat the same waypoint mission at each windmill, except for using a different starting location at each windmill. Since, DJI Go
Not sure if your question got cut off there at the end, but have you tried copying your flight plans and then adjusting each starting point on the copy accordingly?
You can copy each flight plan using the three buttons to the right of the plan name.
Then you can rename it and drag the new one to the new windmill site.
You can change the starting point by adjusting the Flight Direction slider.