In the IALA system, what do Isolated Danger Marks represent?

Isolated Danger Marks are specifically designed to indicate hazards to navigation. These marks are used to alert mariners to dangers that are not associated with any particular channel or navigable area, such as submerged rocks or wrecks. The key characteristic of these marks is that they are placed on or near an isolated danger, making it clear to navigators that caution is necessary in that vicinity.

In practice, an Isolated Danger Mark is typically depicted as a black and red vertical striped buoy, often featuring top marks that resemble two horizontal black balls. The presence of these distinct colors and shapes helps to make them easily identifiable among other navigational aids. By understanding that Isolated Danger Marks signify hazards, mariners can take appropriate action to avoid potential risks while navigating.