Top-down view with north at the top. A wind of 270/15 means wind from 270 degrees, the west, at 15 knots. Air streams in from the west side of a compass ring, where a green FROM marker sits, and flows towards the east; the windsock in the middle streams out downwind, to the east. A drone then flies into wind, towards the west, and moves slowly over the ground (headwind), turns, and flies back downwind much faster (tailwind). Speeds are schematic.
