Podcast
Questions and Answers
In a crossing situation between two power-driven vessels, which vessel typically has the right of way?
In a crossing situation between two power-driven vessels, which vessel typically has the right of way?
When a vessel is uncertain whether it is in a head-on or crossing situation, what should it assume and do?
When a vessel is uncertain whether it is in a head-on or crossing situation, what should it assume and do?
What does the two-letter signal 'NC' in the International Code indicate to vessels?
What does the two-letter signal 'NC' in the International Code indicate to vessels?
In a traffic separation zone, what activity should a vessel using the scheme NOT engage in?
In a traffic separation zone, what activity should a vessel using the scheme NOT engage in?
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When two power-driven vessels are crossing at night and there is a risk of collision, which vessel should give way?
When two power-driven vessels are crossing at night and there is a risk of collision, which vessel should give way?
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What should a vessel entering a traffic separation zone forgo doing?
What should a vessel entering a traffic separation zone forgo doing?
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What is the purpose of a traffic separation scheme?
What is the purpose of a traffic separation scheme?
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In poor visibility, what is the best way to monitor the risk of collision?
In poor visibility, what is the best way to monitor the risk of collision?
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What does a vessel constrained by its draught have to show as additional lights?
What does a vessel constrained by its draught have to show as additional lights?
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Which situation does the display of three red lights in a vertical line indicate?
Which situation does the display of three red lights in a vertical line indicate?
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What is the duration of a 'short blast' on the whistle?
What is the duration of a 'short blast' on the whistle?
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What is the term for routeing measure aimed at the separation of opposing streams of traffic by establishing traffic lanes?
What is the term for routeing measure aimed at the separation of opposing streams of traffic by establishing traffic lanes?
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When observing masthead lights and both side lights of another vessel at night, what action should be taken?
When observing masthead lights and both side lights of another vessel at night, what action should be taken?
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In Annex II of the Collision Regulations, what does the signal 'one white light over one red light' for fishing vessels in close proximity indicate?
In Annex II of the Collision Regulations, what does the signal 'one white light over one red light' for fishing vessels in close proximity indicate?
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When the bearing is steady and the range is 5 miles, what is indicated by a slow reduction in range?
When the bearing is steady and the range is 5 miles, what is indicated by a slow reduction in range?
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What should be done on nearing a bend in a narrow channel when the way ahead is obscured and you hear a prolonged blast?
What should be done on nearing a bend in a narrow channel when the way ahead is obscured and you hear a prolonged blast?
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In a narrow channel, if you observe masthead lights and both side lights of another vessel at night, what does it imply?
In a narrow channel, if you observe masthead lights and both side lights of another vessel at night, what does it imply?
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When navigating close to the outer limit of a channel with a vessel nearby, what action should be avoided if possible?
When navigating close to the outer limit of a channel with a vessel nearby, what action should be avoided if possible?
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What is the prescribed range for the fundamental frequency of a whistle for a vessel between 75 meters and 200 meters in length, as per Annex III of the COLREGS?
What is the prescribed range for the fundamental frequency of a whistle for a vessel between 75 meters and 200 meters in length, as per Annex III of the COLREGS?
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Where should the forward anchor light of a vessel of 50 meters or more in length be placed above the hull, according to COLREGS, Annex I?
Where should the forward anchor light of a vessel of 50 meters or more in length be placed above the hull, according to COLREGS, Annex I?
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According to COLREGS Annex IV, what does an orange flag with a black circle and a square shape indicate?
According to COLREGS Annex IV, what does an orange flag with a black circle and a square shape indicate?
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How far apart shall the whistles of a combined whistle system be located?
How far apart shall the whistles of a combined whistle system be located?
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In what direction shall the light indicating the outlying gear from a fishing vessel be placed in relation to the all-round red and white lights?
In what direction shall the light indicating the outlying gear from a fishing vessel be placed in relation to the all-round red and white lights?
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For power-driven vessels of 20 meters or more in length, how high should two or three lights carried vertically be above the hull, except where a towing light is required?
For power-driven vessels of 20 meters or more in length, how high should two or three lights carried vertically be above the hull, except where a towing light is required?
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Which option describes a light characteristic requirement for stern and masthead lights on a vessel as per COLREGS?
Which option describes a light characteristic requirement for stern and masthead lights on a vessel as per COLREGS?
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Where should two or three lights on a power-driven vessel of less than 20 meters in length be placed above, except when a towing light is required?
Where should two or three lights on a power-driven vessel of less than 20 meters in length be placed above, except when a towing light is required?
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According to COLREGS Annex I, how should the vertical separation of masthead lights of a power-driven vessel be when viewed from sea level?
According to COLREGS Annex I, how should the vertical separation of masthead lights of a power-driven vessel be when viewed from sea level?
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What fundamental frequency range is required for a vessel less than 75 meters in length, according to Annex III of the International Collision Regulations?
What fundamental frequency range is required for a vessel less than 75 meters in length, according to Annex III of the International Collision Regulations?
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What is the purpose of firing a gun at one-minute intervals according to COLREGS Annex IV?
What is the purpose of firing a gun at one-minute intervals according to COLREGS Annex IV?
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What is the minimum sound pressure level required at a distance of one meter from a bell or gong, as specified in Annex III of COLREGS?
What is the minimum sound pressure level required at a distance of one meter from a bell or gong, as specified in Annex III of COLREGS?
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In terms of audibility, within what range should the fundamental frequency of a whistle for a vessel 200 meters or more in length be according to COLREGS Annex III?
In terms of audibility, within what range should the fundamental frequency of a whistle for a vessel 200 meters or more in length be according to COLREGS Annex III?
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What is the required minimum length for a vessel if the fundamental frequency of its whistle is between 250 - 700 Hz based on COLREGS Annex III?
What is the required minimum length for a vessel if the fundamental frequency of its whistle is between 250 - 700 Hz based on COLREGS Annex III?
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Under COLREGS Annex III, what is the audibility range for a whistle signal where two miles can be covered?
Under COLREGS Annex III, what is the audibility range for a whistle signal where two miles can be covered?
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For a directional whistle under COLREGS Annex III, what is the maximum allowed difference in sound pressure level from the prescribed level on the axis within the horizontal plane?
For a directional whistle under COLREGS Annex III, what is the maximum allowed difference in sound pressure level from the prescribed level on the axis within the horizontal plane?
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Study Notes
Whistle Signals
- Five or more short blasts on the whistle indicate danger or warning.
- One long blast followed by three short blasts on the whistle indicates a vessel is towing.
- Five or more short blasts on the whistle in a continuous sequence indicate a vessel in distress.
COLREGS Annex I
- The vertical separation of masthead lights on a power-driven vessel shall be such that the after light can be seen over and separate from the forward light, at a distance from the stem, at all conditions of trim.
COLREGS Annex III
- The fundamental frequency of a whistle for a vessel less than 75 meters in length shall be between 250-700 Hz.
- A bell or gong shall produce a sound pressure level of not less than 110 dB at a distance of one meter.
- The fundamental frequency of a whistle for a vessel 200 meters or more in length shall be between 130-350 Hz.
- The audibility range of a whistle is two miles.
COLREGS Annex IV
- Firing a gun at one-minute intervals indicates a vessel is in distress.
Whistle Characteristics
- The fundamental frequency of a whistle shall be within the range of 70-700 Hz for a vessel less than 75 meters in length.
- The fundamental frequency of a whistle shall be within the range of 130-500 Hz for a vessel 200 meters or more in length.
Sound Pressure Level
- The sound pressure level of a directional whistle shall not be more than 4 dB below the prescribed sound pressure level on the axis at any direction in the horizontal plane within ± 45° of the axis.
Vessel Lighting
- A vessel constrained by its draught shall show three red lights in a vertical line.
- A vessel restricted in its ability to maneuver shall show two red lights in a vertical line.
- A vessel engaged in towing shall show a white light over a red light.
Navigation
- A vessel shall avoid anchoring in a traffic separation scheme or near its terminations.
- A vessel shall monitor the risk of collision in poor visibility using radar and other available means.
Distress Signals
- Firing a gun or rocket at one-minute intervals indicates a vessel is in distress.
- A vessel in distress may also use three short blasts on the whistle.
- A vessel in distress may also use a square flag with a ball below or a black ball.
Miscellaneous
- A combined whistle system is to be regarded as a single whistle.
- A whistle shall be positioned as high as practicable and so arranged as to minimize hearing damage to personnel.
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Description
Test your knowledge on navigation lights and vessel interactions with this quiz. Questions cover scenarios such as seeing sidelights of a vessel directly ahead, determining head-on or crossing situations, and actions to take in different encounters.
