10 Questions
What should a vessel do when it hears a fog signal forward of the beam?
Reduce speed to reply with its own fog signal
In the event of a collision where ships are locked together, what action should not always be taken?
Make a substantial course alteration
In a traffic separation scheme, which vessels are prohibited from impeding the passage of other vessels?
A sailing vessel of less than 20 meters in length
What action is required if your ship is in collision in the waters of a foreign nation?
Inform the appropriate authorities if practicable
When seeing lights right ahead at medium range in open waters, what should be done?
Maintain course and speed
Which action is NOT part of the responsibility of the MASTER in case of a collision?
Make a substantial course alteration
According to Collision Regulations, what provision can be made by the Government of any State between vessels?
Use of additional horn signals
'Rule 19' requires a vessel hearing a fog signal forward of the beam to:
Sound its own fog signal in response.
What is the required action when two black balls are seen in a vertical line on another vessel?
Avoid altering course.
When should a vessel avoid impeding the safe passage of other ships in a traffic separation scheme?
If less than 20 meters in length.
Study Notes
Whistle Signals
- Whistle signals: 5 or more short blasts, rapid blasts, or a combination of both to signal warning or danger
- Sound pressure level of a whistle: at least 130 dB at 1 meter
- Audibility range of a whistle: at least 2 miles in still air and still water
COLREGS (International Regulations for Preventing Collisions at Sea)
- Annex I: vertical separation of masthead lights on a power-driven vessel
- Annex III: whistle signals, sound pressure levels, and audibility ranges
- Annex IV: firing of a gun at 1-minute intervals indicates a vessel is in distress
Lights and Shapes
- Sidelights of a vessel 20 meters or more in length: fitted with screens
- Minimum intensity of sidelights: 1° and 3° outside the prescribed sector
- Vessels engaged in fishing with purse seine gears: exhibit two yellow lights in a vertical line
Navigation and Collision Prevention
- Good seamanship: considering dangers of navigation and collision, and special circumstances
- "Underway" means a vessel is not at anchor or made fast to the shore
- Safe speed: related to prevailing circumstances and conditions
Traffic Separation Schemes
- Vessels engaged in fishing shall not impede the passage of a power-driven vessel following a traffic lane
- Vessels of less than 20 meters in length or sailing vessels shall not impede the safe passage of a vessel following a traffic lane
Test your knowledge on sound signals used in maritime and emergency situations. This quiz covers different types of short and long blasts from whistles, fog horns, and guns.
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