Is this possible?

[RickDan]

I live adjacent to the Missouri River in Montana. Our property has about a mile of river frontage. I enjoy flying my Air3s over the river and have done so often. Had an interesting message on my RC2 while getting ready to take flight. The message appeared for several seconds then left. The message said that there was a manned aircraft present and my flight was limited to 120 ft. (not a quote but best I remember). Didn't know that was possible. Probably should have known about that feature but I didn't but I am impressed. Delayed my takeoff and sure as heck, I observed a low altitude Piper Cub well away from me but also flying following the river.

 

[Starz]

May have been 120 meter warning.

 

[PanoVolo]

Air3 has ads-b aka "airsense" so it does detect nearby aircraft equipped with ads-b