Symptom: Why is the top line of my A321 displaying SBAS instead of GNSS?
Cause: The display automatically changes from SBAS to GNSS when it is unlocked for Glonass.
Resolution: If the user wants to unlock the A320/A321 for Glonass it is required the he enters an unlock code into the subscriptions page by getting a code from customer service and entering that code. The user needs to have both the A320 and A321 unlocked for Glonass to receive the Glonass signal.