Overtaking, International
Overtaking on the other vessel's starboard side
I intend to overtake you on your starboard side.
Two prolonged blasts, then one short blast
Who sounds it
Vessel intending to overtake, in sight, in a narrow channel or fairway, when the other vessel must act to permit safe passing (Rule 9(e)(i)).
How it's sounded
Short blast: about 1 second (Rule 32(b)). Prolonged blast: 4 to 6 seconds (Rule 32(c)); 5 seconds is used here. The rule sets no gap between blasts. 1 second is used here so the blasts stay distinct.
A short blast is about 1 second. A prolonged blast is 4 to 6 seconds. Clips use 1 and 5 seconds.
Worth remembering
Two prolonged opens the request. One short at the end means starboard, the same count as Inland.
More in overtaking
- Overtaking on the other vessel's port sideInternationaltwo prolonged blasts, then two short blasts
- Agreeing to be overtakenInternationalone prolonged blast, then one short blast, then one prolonged blast, then one short blast
- Overtaking on the other vessel's starboard sideInlandone short blast
- Overtaking on the other vessel's port sideInlandtwo short blasts
- Agreeing to be overtaken on your starboard sideInlandone short blast
- Agreeing to be overtaken on your port sideInlandtwo short blasts
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
Helm drills every signal with flashcards and spaced review, on the web and iPhone.
Start freeSources
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.