Sponsored by:
Collision avoidance is one of the most critical aspects of navigation and seamanship. Despite modern navigation equipment, collisions and near-misses remain common, often because basic rules are misunderstood or poorly applied. The International Regulations for Preventing Collisions at Sea, commonly known as the COLREGs, exist to reduce these risks.
This article explains collision avoidance in clear, practical terms, focusing on how recreational boaters can apply the COLREGs confidently and improve safety at sea.
Why Collision Avoidance Matters
At sea, boats operate without fixed lanes, brakes, or traffic lights. Safe navigation depends on cooperation, awareness, and a shared understanding of responsibilities. Failure to avoid collisions can result in:
- Serious injury or loss of life
- Vessel damage or sinking
- Legal consequences and insurance claims
Effective collision avoidance begins with good seamanship, not just rule knowledge.
The Purpose of the COLREGs
The COLREGs provide a set of internationally recognised rules that govern how vessels should behave when encountering one another. Their purpose is not to assign blame after an accident, but to prevent collisions from happening in the first place.
The rules apply to:
- All vessels, large and small
- Sailing and power-driven craft
- Day and night navigation
- Open sea and connected waters
Recreational boaters are expected to understand and follow the COLREGs at all times.
Rule 5: Lookout – The Foundation of Safety
Rule 5 states that every vessel must maintain a proper lookout by sight and hearing at all times. This is the single most important collision avoidance rule.
A proper lookout involves:
- Continuous visual scanning of all sectors
- Listening for sound signals and engines
- Using all available means, including radar if fitted
Electronic aids do not replace a human lookout. Many collisions occur because one vessel simply fails to notice another in time.
Rule 6: Safe Speed
Safe speed is not defined by a number, but by conditions. Rule 6 requires vessels to proceed at a speed that allows effective action to avoid collision.
Factors affecting safe speed include:
- Visibility and weather conditions
- Traffic density
- Manoeuvrability of the vessel
- Background lighting at night
If you cannot stop or turn in time to avoid danger, you are travelling too fast.
Understanding Risk of Collision
Rule 7 requires skippers to assess whether a risk of collision exists. One of the simplest methods is visual observation.
Constant Bearing, Decreasing Range
If another vessel remains on a steady bearing while the distance closes, a collision risk exists.
Additional indicators include:
- Uncertainty about the other vessel’s intentions
- Rapidly closing distance
- Limited sea room
When in doubt, assume risk exists and act early.
Rule 8: Action to Avoid Collision
Actions taken to avoid collision must be:
- Positive and made in good time
- Large enough to be obvious to the other vessel
- Consistent with good seamanship
Small, hesitant course changes often create confusion and increase risk.
Whenever possible, avoid altering course to port when another vessel is forward of the beam.
Give-Way and Stand-On Vessels Explained
The COLREGs define which vessel must keep out of the way (give-way) and which should maintain course and speed (stand-on).
Power-Driven Vessels
- Head-on: both vessels alter course to starboard
- Crossing: the vessel with the other on her starboard side gives way
Sailing Vessels
- Port tack gives way to starboard tack
- Windward vessel gives way to leeward vessel
Stand-on vessels must still act if it becomes clear the give-way vessel is not taking appropriate action.
Special Situations and Restricted Vessels
Certain vessels have priority due to their operational limitations.
These include:
- Vessels not under command
- Vessels restricted in their ability to manoeuvre
- Vessels engaged in fishing
- Large commercial vessels in narrow channels
Recreational craft should always give these vessels plenty of room.
Collision Avoidance in Restricted Visibility
Fog, rain, or darkness significantly increase collision risk.
In restricted visibility:
- Reduce speed immediately
- Post an enhanced lookout
- Use sound signals as required
- Be prepared for close-quarters situations
Radar, if fitted, should be used correctly and monitored continuously.
Common Collision Avoidance Mistakes
| Mistake | Resulting Risk |
|---|---|
| Late or small course alterations | Misunderstanding and close-quarters situations |
| Assuming right of way | Failure to act when required |
| Poor lookout | Late detection of hazards |
| Excessive speed | Inability to avoid collision |
Why Good Seamanship Prevents Collisions
While the COLREGs provide structure, good seamanship fills the gaps. Courtesy, anticipation, and clear actions reduce ambiguity and encourage cooperation between vessels.
Experienced skippers aim to avoid close encounters altogether, rather than relying on last-minute manoeuvres.
Conclusion
Collision avoidance is a shared responsibility. Understanding the COLREGs, maintaining a proper lookout, and acting early and decisively are essential to safety at sea.
For recreational boaters, clear knowledge combined with practical seamanship greatly reduces risk and helps ensure that every passage is both safe and enjoyable.
Comments