Which mark indicates that the buoy is a safe water mark?

• A. Red and white vertical stripes
• B. Black horizontal bands
• C. Blue and yellow vertical stripes
• D. Yellow with crossed topmark

Answer: (A)

The indication that a buoy is a safe water mark is represented by red and white vertical stripes. These color patterns signify that mariners are approaching a fairway or channel that is clear of hazards, allowing for safe navigation. Safe water marks are used in maritime navigation to guide vessels; they indicate that there are navigable waters all around the buoy, making it crucial for navigators to be aware of these signals as they help avoid hazards in the water.

The other choices do indicate different types of buoys. For instance, black horizontal bands signal that the buoy is a special mark, while blue and yellow vertical stripes are typically associated with information marks, which may be of a non-navigational purpose. Meanwhile, a yellow buoy with a crossed topmark is often indicative of a buoy marking a specific hazard or warning. Understanding these markers and their meanings is essential for safe navigation at sea.