10 Questions
According to Rule 4, when do the rules apply?
In any condition of visibility
According to Rule 5, what does maintaining a proper look-out involve?
Using all available means appropriate to prevailing circumstances and conditions
According to Rule 6, what should every vessel do regarding its speed?
Proceed at a safe speed at all times
According to Rule 6, what factors should be taken into account when determining safe speed?
All of the above
According to Rule 6, what should a vessel's speed allow it to do?
Avoid collision and be stopped within distance appropriate to prevailing circumstances and conditions
According to Rule 6, what are the facts that should be taken into account in determining safe speed?
i) State of visibility ii) Traffic density; concentrations of fishing vessels or other vessels. iii) Manoeuvrability of vessel with special reference to stopping distance and turning ability in prevailing conditions. iv) At night, presence of background light (shore lights or from back scatter of her own lights). v) State of wind, sea, and current & proximity of navigational hazards vi) Draught in relation to available depth of water.
What is the purpose of Rule 6 (Safe Speed)?
To ensure that every vessel proceeds at a speed that allows it to take proper and effective action to avoid collision and be stopped within a distance appropriate to prevailing circumstances and conditions.
What are the factors that vessels with operational radar should consider when determining safe speed?
i) Characteristics, efficiency & limitations of radar equipment ii) Constraints imposed by radar range scale in use iii) Effect on radar detection of sea state, weather and other sources of interference
According to Rule 6, what should vessels take into account when determining safe speed at night?
Presence of background light (shore lights or from back scatter of her own lights)
What should vessels consider when determining safe speed in relation to draught and available depth of water?
i) State of visibility ii) Traffic density; concentrations of fishing vessels or other vessels. iii) Manoeuvrability of vessel with special reference to stopping distance and turning ability in prevailing conditions. iv) At night, presence of background light (shore lights or from back scatter of her own lights). v) State of wind, sea, and current & proximity of navigational hazards vi) Draught in relation to available depth of water.
Study Notes
International Regulations for Preventing Collisions at Sea (COLREGS)
Rule 4
- The rules apply at all times, day and night, in all visibility conditions.
Rule 5
- Maintaining a proper look-out involves using all available means, such as keeping a visual watch, using radar, and monitoring navigation aids.
Rule 6
- Every vessel should proceed at a safe speed, taking into account the prevailing circumstances and conditions.
- Factors to be taken into account when determining safe speed include:
- Visibility and weather conditions
- Traffic density
- State of wind, sea, and current
- Visibility from the bridge
- The possibility of radar interference
- The state of the vessel and its cargo
- A vessel's speed should allow it to take proper action to avoid collision and to be stopped within a distance appropriate to the prevailing circumstances and conditions.
- Facts to be taken into account in determining safe speed include:
- The state of the vessel and its cargo
- The presence of other vessels, including those not under command
- The presence of other hazards
- The purpose of Rule 6 is to ensure safe speed, taking into account the prevailing circumstances and conditions.
- Vessels with operational radar should consider:
- The characteristics, efficiency, and limitations of the radar system
- Any constraints imposed by the radar range scale
- The effect of interference on radar performance
- At night, vessels should take into account the visibility of lights and shapes of other vessels.
- When determining safe speed, vessels should consider the draught and available depth of water, taking into account the vessel's manoeuvrability and stopping distance.
Test your knowledge of the International Regulations for Preventing Collisions at Sea (COLREGS) with this quiz. Learn about the application of rules in different visibility conditions, maintaining proper lookout, and navigating at safe speeds to avoid collisions.
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