Characteristics:-

• You won’t see many of these as they will only be in position over new wrecks for perhaps a day or so.
• Pillar or spar buoy
• Equal number of blue and yellow vertical stripes.
• Topmark - if fitted, a yellow +.
• Light - blue and yellow alternating flashes. Typically blue for 1 second, then a 1/2 second gap then yellow for 1 second, then a 1/2 second gap. B1.0s+0.5s+Y1.0s+0.5s

Memory Aids:-

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