Observe and identify
Developing level, about 3 min. International COLREGs / IRPCS.
The situation
You are nearing a channel bend where an intervening obstruction hides approaching traffic. A vessel approaching from around the bend sounds a signal. Hear it and select the appropriate reply.
Which sound should you return around this bend?
- One prolonged blast in reply
- One short blast
- Remain silent because the other vessel cannot be seen
Answers and explanations
Lookout: The bend signal and its reply have the same pattern; context distinguishes it from a making-way fog signal.
The sound answer
One prolonged blast in reply
Rule 34(e): a vessel approaching within hearing around a bend replies with a prolonged blast. Keep a proper lookout and proceed cautiously.
Why the other options fall short
One short blast
An International short blast announces starboard alteration by a power-driven vessel in sight, rather than answering this bend signal.
Remain silent because the other vessel cannot be seen
The bend signal specifically addresses an intervening obstruction. A vessel approaching within hearing replies with one prolonged blast.
Rule 34(e) · Bend or obstruction
A vessel nearing a bend or area where other vessels may be obscured by an intervening obstruction sounds one prolonged blast. An approaching vessel within hearing around the bend answers with one prolonged blast.