During clearance, the runway to be used is announced.
The announcement is made in the form of the runway number, which is derived from the magnetic departure direction as a two-digit number of ten (080° -> 08).
In reality and also on some DCS multiplayer servers with human ATC, the exact taxi path to the runway is also given with the taxi clearance.
Example:
- Our training airfield Kutaisi:

- Take-off position announced by ATC: 08.
- Check: Where do I have to hold to take off in direction 080?
- Which taxiways were explicitly given, or can I find my own way?
Usually you taxi parallel to the runway in the opposite direction until you reach the correct taxi hold at the end of the runway.