Observe and identify
Foundation level, about 2 min. International COLREGs / IRPCS.
The situation
In fog a vessel nearby has given her required anchor signal. She gives this optional whistle warning as you approach.
What can you conclude from the signal in these circumstances?
- She warns of her position and possible collision
- She agrees to an overtaking passage
- She announces making way under power
Answers and explanations
Lookout: Use the situation as well as the sound. Listen to the full sequence before deciding.
The sound answer
She warns of her position and possible collision
Warns an approaching vessel of the anchored vessel’s position. In or near restricted visibility, by day or night. The signal gives operating information; it does not establish a stand-on vessel. An optional supplement to the required anchor signal.
Why the other options fall short
She agrees to an overtaking passage
Warns an approaching vessel of the anchored vessel’s position. In or near restricted visibility, by day or night. The signal gives operating information; it does not establish a stand-on vessel. An optional supplement to the required anchor signal.
She announces making way under power
Warns an approaching vessel of the anchored vessel’s position. In or near restricted visibility, by day or night. The signal gives operating information; it does not establish a stand-on vessel. An optional supplement to the required anchor signal.
Rule 35(g) · Optional anchor whistle warning
Warns an approaching vessel of the anchored vessel’s position. In or near restricted visibility, by day or night. The signal gives operating information; it does not establish a stand-on vessel. An optional supplement to the required anchor signal.