Sea marks are a system of markers that help seafarers identify potential hazards, roadblocks, situations, requirements, and instructions that must be followed in their navigational course. These seamarks are of various types and appearances, following a sign convention based on the designated purpose, reports Marine Insight.
Isolated Danger Mark
In this article, we will discuss a specific type of sea mark known as an isolated danger mark. As the name suggests, an isolated danger mark is a sea mark employed to identify a specific hazard under the water that is not visible to a seafarer or navigator.
These include submerged wrecks or objects, rocks, boulders, reefs, shoals, and other underwater geographical features, such as a subsea hill or ridge that tips dangerously close to the waterline.
Preventive actions
By looking at an isolated danger mark, a seafarer needs to take preventive actions like steering the vessel away from the trajectory that has the hazard in its projected course and ply not over or even too close such that any form of underwater presence does not cause incidents like grounding or breach in the hull due to impact from the bottom.
The light flashes in groups of two at 5 to 10 seconds. When you spot an isolated danger mark, the beacon or flashlight flashes twice successively and remains dormant for about 5 to 10 seconds before flashing twice again.
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Source: Marine Insight
