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IALA buoyage system 'A' – safe water marks

Safe water marks indicate that there is navigable water all around the mark, for example mid-channel or landfall buoy.

Safe water mark features:

  • Colour: red and white vertical stripes.
  • Top mark: a single red sphere.
  • Light: exhibits a white light, isophase, occulting, or single long flash every 10 seconds.
  
Single flash and a single sphere association may help you to remember its characteristics.
Image of a safe water mark during daylight
Image of a safe water mark at night
 


Last reviewed: 05 March 2012