COLREGS PART D SOUND AND LIGHT SIGNALS Flashcards
What is COLREGS PART D?
SOUND AND LIGHT SIGNALS.
How long is a short blast?
1 second’s duration.
How long is a prolonged blast?
4-6 second’s duration.
What is the sound equipment installed onboard in accordance with its length?
12m or more - WHISTLE
20m or more - BELL + WHISTLE
100m or more - GONG + BELL + WHISTLE
When are Manoeuvring and Warning signals used?
When vessels are insight of one another. A power-driven vessel while underway.
What is the sound signal for “I am altering my course to starboard”?
•
1 short blast
What is the sound signal for “I am altering my course to port”?
••
2 short blasts
What is the sound signal for “I am operating astern propulsion”?
•••
3 short blasts
What is the interval duration between each flash and each successive flashes?
The interval between flashes shall be about 1 second, and the interval between successive signals shall be not less than 10 seconds.
When insight of one another in a narrow channel or fairway, what are the signals given by the overtaking vessel?
– – •
2 prolonged blasts followed by 1 short blast to mean
“I intend to overtake you on your starboard side”
– – • •
2 prolonged blasts followed by 2 short blasts to mean
“I intend to overtake you on your port side”.
What is the signal given by the vessel about to be overtaken to indicate her agreement?
– • – •
1 prolonged, 1 short, 1 prolonged and 1 short blast, in that order.
What are the signals given when vessels in sight of one another are approaching each other and from any cause either vessel fails to understand the intentions or actions of the other?
• • • • •
At least five short and rapid blasts on the whistle.
What are the signals given by a vessel nearing a bend or an area of a channel or fairway where other vessels may be obscured by an intervening obstruction?
–
shall sound 1 prolonged blast.
Sound signals in restricted visibility.
1] What signals does a power-driven vessel making way through the water give?
2] What signals does a power-driven vessel underway but stopped give?
Sound signals in restricted visibility
1] At intervals of not more than 2 minutes one prolonged blast.
– ⇔ –
2mins
2] at intervals of not more than 2 minutes two prolonged blasts in succession with an interval of about 2 seconds between them.
2 secs 2 secs
– ⇔ – ⇔ – ⇔ –
2 mins
What signals do the following vessels give?
- A vessel not under command
- A vessel restricted in her ability to manoeuvre
- A vessel constrained by her draught
- A sailing vessel
- A vessel engaged in fishing
- A vessel engaged in towing or pushing another vessel
- A vessel engaged in fishing, when at anchor,
- A vessel restricted in her ability to manoeuvre when carrying out her work at anchor.
Sound at intervals of not more than 2 minutes three blasts in succession, namely one prolonged followed by two short blasts.
– • • ⇔ – • •
2mins
What are the signals given by a vessel towed or if more than one vessel is towed the last vessel of the tow if manned?
Shall at intervals of not more than 2 minutes sound four blasts in succession, namely one prolonged followed by three short blasts.
– • • • ⇔ – • • •
2 mins
What are the sound signals given by the vessel at anchor?
Shall at intervals of not more than one minute ring the bell rapidly for about 5 seconds.
More than 100m- the gong shall be sounded rapidly for about 5 seconds in the after part of the vessel after the ringing of the bell.
In addition sound three blasts in succession, namely one short, one prolonged and one short blast
• – •
What sound signals shall a vessel aground give?
For vessels less than 100m -
♦¤× (Ringing of the bell for 5 secs) ♦¤×
For vessels more than 100m -
♦¤× (Ringing of the bell for 5 secs in the forepart) ♦¤× (ringing of the gong in the aft for 5 secs)
♦¤×- 3 separate and distinct strokes on the bell.
What sound signal does a pilot vessel when engaged on pilotage duty give?
4 short blasts.
••••
Which vessels are not required to sound signals when at anchor?
- A vessel of 12 metres or more but less than 20 metres in length
- A vessel of less than 12 metres in length
