Option 1. (greyhawk)
Spawn greyhawk at south end of runway 02 facing north.
Take control of the turret and switch to 3rd person.
Give it a waypoint and watch it depart on a 015 heading.
Take direct control of the greyhawk looking through pilot camera and immediately switch on landing autopilot.
Observe the aircraft land on runway 02 on a heading of 015 every time.
Option 2. range finder or laser designator.
Go prone on the center line stripe and observe the actual compass heading when looking down the stripe facing south down runway 20 you will see 195. When facing north along runway 02 you will see 015.