IALACOLREG
9

Narrow Channels

A vessel proceeding along the course of a narrow channel shall keep as near to the outer limit of the channel which lies on her starboard side.

Rule 9 governs navigation in narrow channels and fairways.

a
A vessel following the channel shall keep as near to the outer limit on her starboard side as is safe and practicable.
b
A vessel of less than 20 metres or a sailing vessel shall not impede a vessel that can safely navigate only within the channel or fairway.
c
A vessel engaged in fishing shall not impede any other vessel navigating within the channel or fairway.
d
A vessel shall not cross the channel if doing so would impede a vessel that can safely navigate only within it.
e
Overtaking in a narrow channel may require the agreement and cooperation of the vessel being overtaken, using the prescribed whistle signals.
f
Any vessel shall, if the circumstances admit, avoid anchoring in a narrow channel.

STCW Bridge Watch Lens

1

In confined waters, think in terms of not impeding the vessel that is constrained by the channel or the traffic lane, then manoeuvre early to stay clear.

2

Build the traffic picture with sight, hearing, radar/ARPA and chart context. Do not let AIS or one isolated bearing replace systematic observation.

3

After manoeuvring, keep monitoring bearing, range, CPA/TCPA and passing distance until the other vessel is finally past and clear.

Exam Focus

1

Start every scenario by classifying the encounter: overtaking, head-on, crossing, narrow channel, traffic separation, or restricted visibility.

2

If two rules seem to conflict, check the order carefully: overtaking duties still apply, and Rule 2 still requires ordinary seamanship.

3

Questions on channels and TSS often test the difference between 'keep out of the way' and 'shall not impede'. Read that wording carefully.

Key Takeaways

1

In a narrow channel, keep as far to starboard as is safely practicable

2

Small craft, sailing craft and fishing vessels must not impede the ship that needs the channel

3

Crossing and overtaking are allowed only when they do not create danger for channel traffic

4

Anchoring in the channel should be avoided unless the circumstances genuinely require it

Common Mistakes

Treating a narrow channel like open water and drifting toward the middle or the wrong side

Crossing in front of a deep-draught or constrained vessel that has little room to manoeuvre

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