Distress signal

HMS Romney aground off the Texel in 1804. In Richard Corbould's print, Romney's blue ensign at the stern is shown inverted, as a sign of distress

A distress signal or distress call is an internationally recognized means for obtaining help. Distress signals take the form of or are commonly made by using radio signals, displaying a visually detected item or illumination, or making an audible sound, from a distance.

单词	Distress flag
释义	Distress flag 英语百科 Distress signal A distress signal or distress call is an internationally recognized means for obtaining help. Distress signals take the form of or are commonly made by using radio signals, displaying a visually detected item or illumination, or making an audible sound, from a distance.
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Distress flag

Distress signal