Sail Skills - ColRegs 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.
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ColRegs Home>ColRegs>Steer & Sail Rules>Restricted Visibility>Detected by Radar Rule 19 Vessels in Restricted Visibility Detected by Radar A vessel that detects another by radar alone, shall: determine if: a close-quarters situation is developing or there is a risk of collision and take avoiding action in ample time Head-up radar display with heading and range marker Radar display, with heading and range markers. Display is “head up” - that is own vessel “points” to top of display Radar display, with overlay indicating direction in which to alter course The overlay below indicates the direction in which to alter course: S = alter to starboard P = alter to port Note particularly the arrow on the starboard beam - it will be explained later! Radar display, with overlay indicating direction in which to alter course If then a target is detected on the starboard bow, and avoiding action is required, make a substantial alteration of course to starboard if possible: Radar display, with target on starboard bow. Overlay indicates to alter course to starboard Radar display, with target on starboard bow. Overlay indicates to alter course to starboard With the target on the port bow (this one would pass close ahead) a substantial alteration of course to starboard is also indicated: Radar display, with target on port bow. Overlay indicates to alter course to starboard Radar display, with target on port bow. Overlay indicates to alter course to starboard Radar display, with target on starboard beam. Overlay indicates to alter course to port Radar display, with target on starboard beam. Overlay indicates to alter course to port back to top View ahead in restricted visibility Diagram: radar with overlay to indicate direction in which to alter course Detected by radar Late morning in the Caribbean. View from the bridge of cargo ship in heavy rain General actions Forward of the beam The actions can be approximated in an (imaginary) overlay. Consider a typical radar display:
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