What is a Common application of Special Marks?

The correct answer highlights that Special Marks are primarily used to indicate specific features or information in navigational contexts that do not fit into standard categories. They are often utilized to draw attention to certain areas or conditions that mariners should be aware of, such as speed limits in specific zones. Special Marks, typically yellow in color, are employed in various situations to convey important regulatory information or specific navigational alerts that are critical for safe navigation.

In contrast, the other choices refer to more conventional uses of buoys within the maritime buoyage system. Indicating deep water, designating safe passage, and providing navigation ranges are typically accomplished through the use of other types of marks, such as safe water marks or lateral marks, which are specifically designed to guide vessels safely through navigable waters or indicate the location of navigational hazards.