1. A vessel proceeding along the course of a narrow channel or fairway shall keep as near to the outer limit of the channel or fairway which lies on her starboard side as is safe and predictable.
2. A vessel of less than 20 meters in length or a sailing vessel shall not impede the passage of a vessel which can safely navigate only within a narrow channel or fairway.
3. A vessel engaged in fishing shall not impede the passage of any other vessel navigating within a narrow channel or fairway.
4. A vessel shall not cross a narrow channel or fairway if such crossing impedes the passage of a vessel which can safely navigate only within such channel or fairway. The latter vessel may use the sound signal (five short blasts ●●●●●). if in doubt as to the intention of the crossing vessel.
5. a. In a narrow channel or fairway when overtaking can take place only if the vessel to be overtaken has to take action to permit safe passing, the vessel intending to overtake shall indicate her intention by sounding the appropriate signal:
▬ ▬ ● (I wish to overtake from the starboard side)
▬ ▬ ● ● ( I wish to overtake from the port side)
The vessel to be overtaken shall, if in agreement, sound the appropriate signal : ▬ ● ▬ ●
and take steps to permit safe passing. If in doubt she may sound the signals (five short blasts ●●●●●).
b. This Rule does not relieve the overtaking vessel of her obligation under the corresponding rule.
6 . A vessel nearing a bend or an area of a narrow channel or fairway where other vessels may be obscured by an intervening obstruction shall navigate with particular alertness and caution and shall sound the appropriate signal (five short blasts ●●●●●).
7 . Any vessel shall, if the circumstances of the case admit, avoid anchoring in a narrow channel.