Page 212 - Rules of Navigation2020

CHAPTER XI
SIGNALS

Art. 89 - Generalities:

A- All signals used in Canal are mentioned hereafter.
B- All flags and pendants to be hoisted by vessels, as mentioned hereafter, should be those

stated in the International Code of Signals.
C- Night signals shall be hoisted where best be seen by other vessels.

Art. 90 - Sound Signals:
A- Normal maneuver:

(1) The International Regulations for Preventing Collisions at Sea signals.
One short blast : I am altering my course to starboard.

Two short blasts : I am altering my course to port.
Three short blasts : I am operating astern propulsion.

(2) The signal 5 or 6 short blasts repeated several times at short intervals to say:
I am reducing speed and may have to stop or make fast.
At night besides the blasts, four to five long flashes with the Aldis lamp or signal mast

lamp must be made.
(3) The signal one prolonged blast to draw attention.

The expression "short blast" means a blast of about 1 second duration.
The expression "prolonged blast" means a blast of 4 to 6 seconds duration.

B- Obstruction in channel in all circumstances:
Whenever a vessel which under any circumstance causes or finds an obstruction in the

channel she must right away warn other vessels in the vicinity. That warning is given by
whistle or siren:
4 long blasts meaning: “The channel is not free”.

That warning must be repeated every 3 minutes until vessels concerned
have answered in the same manner. As soon as they hear the signal mentioned above, the

vessels take steps to stop and instruct for Radio Watch, to receive a full detail of the
alert given by the vessel that sent the said signal.
The vessel should maintain Radio Watch until otherwise advised.

C- Ship failure (to dredgers):
In case of engine or steering failure making the vessel not under command, while

approaching a dredger, the vessel has to give the signal: one long blast followed by two
short blasts (— ‧ ‧ )

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