An isolated danger buoy serves to mark an isolated hazard that has navigable water all around it. The dangers may be natural in origin, such as shoals, or man-made, such as shipwrecks. When encountering an isolated danger buoy, it’s best to check your marine charts for more information about the hazard, such as its dimensions and depth.
Isolated danger buoys are black with one broad red horizontal band. They are usually spar-shaped, but that isn’t a requirement. If they are equipped with a light or retroreflective material, these items will be white. If the buoys have a topmark, it will be two black spheres stacked one on top of the other.
Boaters need to be familiar with the different types of boating buoys and their meanings in order to avoid hazards and navigate according to the rules of the waterways. Learn about buoys, boating safety and much more with the Transport Canada-approved online boating exam!