передача сигналу біди по радіо
mayday call (‘Mayday, Mayday, Mayday’)
squawk mayday
MAYDAY
Global Broadcast Service (GBS)
VOLMET broadcast
teletype broadcast system
broadcast (to)
broadcast notice to mariners
broadcast
aeronautical broadcast station
warning broadcast net
warning broadcast radio net
reconnaissance broadcast
automatic dependent surveillance-broadcast (ADS-B)