Isolated Danger Buoy Description & Characteristics

June 3, 2025

Updated June 2025 An isolated danger buoy notifies boat operators of a specific type of threat to their vessel’s safety.

What is the purpose of an isolated danger buoy?

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 you encounter an isolated danger buoy, it’s best to check your marine charts for more information about the hazard, such as its dimensions and depth.

What do isloated danger buoys look like?

Which features best describe an isolated danger buoy? 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 will be white. If the buoys have a topmark, it will be two black spheres stacked one on top of the other.

Learn how to recognize boating buoys with Drive a Boat Canada

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. You can learn about buoys, boating safety and much more by taking our Transport Canada-approved safe boating course.

Challenge the online boating exam and earn your Pleasure Craft Operator Card today! Register with Drive A Boat Canada to get started.