Warnings, International and Inland
Answering a bend signal
I'm around the bend and I heard you.
One prolonged blast
Who sounds it
Any approaching vessel that may be within hearing around the bend or behind the obstruction.
How it's sounded
Prolonged blast: 4 to 6 seconds (Rule 32(c)); 5 seconds is used here.
A short blast is about 1 second. A prolonged blast is 4 to 6 seconds. Clips use 1 and 5 seconds.
Worth remembering
The answer is the same one prolonged blast.
The same sound elsewhere
These use the same pattern, so the rules you’re under and the situation decide what it means.
More in warnings
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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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.