While flying today, we kept getting a warning flash up on SD.
It said something like “Warning formation flight up to 3000ft. Active now and for next 50 minutes”,
It pointed to a location about 3-5 miles ahead of our route. We changed direction a couple of times, but it popped up about 5 times, always a similar distance ahead, with the time reducing in real time.
We were above 3000ft so presumably no issue, bur there was nothing notamed in the area.
Is this an error of some sort?