Which mark is used to indicate the position of a hazard?

The mark used to indicate the position of a hazard is the Isolated Danger Mark. This type of mark is specifically designed to draw attention to a danger that is isolated and may be navigable around. An Isolated Danger Mark typically features a black and red color scheme, often with black balls or horizontal stripes that are distinguished to signify the presence of the hazard directly beneath or in close proximity to it.

These marks are essential for navigational safety, as they inform mariners of underwater dangers that need to be avoided while allowing safe passage around them. For instance, an Isolated Danger Mark can indicate a submerged rock, wreck, or any other potentially hazardous feature in the water that could pose a threat to vessels.

In contrast, the other types of marks serve different purposes. Safe Water Marks indicate safe passage and are typically found in areas with navigable waters. Lateral Marks are used to indicate the sides of a channel and direct vessels to keep to the safe side. Cardinal Marks provide information on safe navigable waters relative to the dangers they indicate, based on the cardinal direction. However, none of these marks specifically signal an isolated hazard in the same direct manner as Isolated Danger Marks do.