Airspace managment of Bulgaria
Always be informed in advance of air traffic and submit information to the Flight Information Center about who you are, where, with what and on what course you will fly. Also report the time range you will be in the air.
Up to 30 minutes after the last flight is completed, you must reconnect with the Flight Center to confirm the successful completion of the flights.
Never fly without being informed in detail of air traffic over the time and route you will follow.