Light aircraft flight in TB20 from Tivat, Montenegro to Brac, Croatia flying at low level past Dubrovnik. You are required to remain low after departure to clear out of the way of airliners. The flight up the south west coast of Croatia lands at Brac on a day without air traffic control, requiring self-announcements of position and intentions. Brac has immigration staff and is an official Port of Entry back into the European Union.