International Distress Signals
fog horn continuous sounding
Constant sounding of any fog signal apparatus
gun fired at one minute intervals
Firing of a gun or other explosive once every minute
orange smoke
Igniting an orange smoke signal
dye marker (any color)
Setting a dye marker of any color
"MAYDAY" by radio
Speaking the words "MAY DAY" by radiotelephone
flames on a vessel
creating flames on the vessel (burning a tar barrel, oil barrel, etc.)
parachute red flare
firing a rocket parachute flare with a red light
red star shell
firing of rockets or shells which throw red stars once every minute
orange background black ball and square
flying a piece of orange colored canvas with either a black square and circle or other appropriate symbol for identification from the air.
square flag and ball
hoisting a square flag with a ball, or something that looks like a ball, above or below it
Code flags November charlie
hoisting the international signal flags which indicate November charlie. November is a white and blue checkered flag, and charlie is horizontal stripes of blue, white, red, white, blue
radio telegraph alarm
sending the radiotelegraph alarm signal
radio telephone alarm
sending the radiotelephone alarm signal
sos
signalling of ... --- ... (SOS) in the morse code by radio telegraphy or some other method
wave arms
standing on deck with arms outstretched to each side, slowly and repeatedly raising and lowering arms
position indicating radio beacon
transmitting SOS signals by an emergency position indicating radio beacon (EPIRB)