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>Signals>Fog Signals>Power-Driven Vessels Underway Rule 35 Signals in Restricted Visibility Power-Driven Vessels Underway  There are only two signals for a power-driven vessel underway:   Shall sound at intervals of not more than 2 minutes: back to top Remember: the larger the vessel, the deeper the tone of the whistle:  200m or more: deep 75m or more but less than 200m: medium less than 75m: higher pitch  The sounds cannot be exactly represented, but the link gives a “flavour” Comparison of whistles Note that both vessels display the lights for a power-driven vessel underway - the ColRegs do not make any distinctions here Power-driven vessel underway in restricted visibility Sailing vessel underway in restricted visibility A vessel at anchor in restricted visibility A vessel under 12m underway in restricted visibility Power-driven underway Other vessels underway Anchored & Aground Vessels under 12m Vessel engaged in pilotage duties underway in restricted visibility Vessels engaged in pilotage duties A vessel under 12m:  need not sound any of the specified fog signals but shall make some other “efficient sound signal” at intervals of not more than 2 minutes if she does not make the specified signal Power-driven vessel under way but stopped and not making way  (click on button to listen)
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Prolonged blast small vessel MP3.mp3 Not making way MP3.mp3 Not making way MP3.mp3 Comparison MP3.mp3