Distress, International and Inland

Distress: continuous fog signal

A vessel in distress and needing help.

A continuous sounding

Press play. One signal at a time.

Distress: continuous fog signalInternational and Inland
A vessel in distress and needing help.
Annex IV para. 1(b); 33 CFR 87.01(b)

Who sounds it

A vessel in distress.

How it's sounded

"A continuous sounding." The rule sets no length. This clip stops at 15 seconds to keep it short. The real signal doesn't.

A short blast is about 1 second. A prolonged blast is 4 to 6 seconds. Clips use 1 and 5 seconds.

Worth remembering

It doesn't stop between blasts. A horn that never stops means distress, not a fog signal.

Study more

See every sound signal, try the free Rules of the Road practice test, or read who gives way, and how Inland differs.

Learn the whole set

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Sources

Annex IV para. 1(b); 33 CFR 87.01(b)

Helm is an independent study aid, not affiliated with or endorsed by the U.S. Coast Guard or the National Maritime Center. This page is for study, not navigation guidance or legal advice. Check the current rules before you rely on anything here.