Top-down view with magnetic north up. A runway lies roughly north-east to south-west. Its south-west end is marked 04, because an aircraft landing over that end flies about 040 degrees magnetic; the north-east end is marked 22, about 220 degrees magnetic, 180 degrees different. An aircraft approaches and lands on runway 04, flying towards the north-east. A drone to the west of the runway has a clock face around it with 12 o'clock at its nose. Facing north, the drone sees the approaching aircraft at about 3 o'clock, to the right. The drone then turns to face east and the same aircraft is now at about 12 o'clock, ahead. The runway numbers stay fixed; the clock code moves with the nose. Schematic, not to scale.
