- You wont 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