сигнал біди; сигнал аварійної ситуації; сигнал лиха
distress alert; distress call
distress signal (=SOS)
Signal Kit / MK-79 (illumination signal kit)
Global Maritime Distress Safety System (GMDSS)
ship in distress
suffer distress
distress
distress call
distress landing
distress message
distress phase
distress traffic
in distress
international distress frequency
distress beacon
distress signals
Space System for Tracking Ships and Aircraft in Distress – Search and Rescue Satellite (COSPAS-SARSAT)
radio distress call
acknowledgement signal
arm-and-hand signal
audio signal
caution signal
combined signal
command and signal
command signal center
control signal
echo (returned signal)
field army signal brigade
flash a signal
forward area signal center
hand signal
hoisting signal flags