Sail Skills - ColRegs
Back Free Guide to ColRegs (the International Regulations for Preventing Collisions at Sea, the IRPCS or Collision Regs).  Guidance covers all aspects with animations, pictures and diagrams.  Aimed at small vessel users but suitable for professional mariners.  Especially recommended for RYA examination candidates.
Support the site
© A Joy 2009-13
Manoeuvring & Warn
Vessels in sight of each other
Power-driven vessel underway
Manoeuvring as:
authorised or
by rules
Altering to starboard
May have light signal
Altering to port
· ·
Operating astern propulsion
· · ·
Any vessel
Approaching another
fail understand
actions or
In doubt sufficient action to avoid collision
(or more)
Overtaking in narrow:
channel or
action required vessel to be overtaken
Intend to overtake to starboard
- - ·
By vessel intending to overtake
Intend to overtake to port
- - · ·
- · - ·
By vessel to be overtaken
In doubt
(or more)
Nearing bend or area of channel or fairway
By vessel:
view obstructed and
hearing signal
Fog Signals (Signals in or Near Restricted Visibility)
Power-driven underway
making way
At not more than 2 minutes
stopped and not making way
-  -
Other vessels underway
not under command
- · ·
constrained by draught
restricted in ability to manoeuvre (uses same signal at anchor)
fishing (uses same signal at anchor)
towing or pushing
towed, or last vessel towed (if manned and immediately after towing vessel)
- · · ·
restricted in ability to manoeuvre (uses same signal underway)
- · ·
fishing (uses same signal underway)
Other vessels
under 100m
At not more than 1 minute
100m or more
Bell & Gong
under 20m but 12m or more
At not more than 2 minutes
under 100m
Bell, preceded and followed by three strokes
At not more than 1 minute
100m or more
Bell, preceded & followed by three strokes
& Gong
Under 12m
Appropriate signal above, or
At not more than 2 minutes
Additional Optional Signals in Restricted Visibility
Identity signal
· · · ·
To warn of:
position and
possibility of collision
· - ·
An “appropriate whistle” signal
Attract Attention
   light or
   sound signal
      that cannot be mistaken for any signal authorised in rules or

Shine searchlight towards danger

   such as cannot be mistaken for aid to navigation and
   not high intensity:
               intermittent or
               revolving lights
            such as strobe lights
Summary of Signals
Manoeuvring & Warn Fog Signals Attract Attention Summary Code of Signals
Boating Books