What does the Safe Water Mark indicate?

• A. Entrance to the channel
• B. End of buoy system
• C. Deep and safe water
• D. Entrance or end of channel

Answer: (A)

Safe Water Mark signals that there is safe water all around the mark. It’s used where navigable water surrounds the mark, often placed at the approach to a harbour or the entrance to a channel, to guide vessels into deeper water beyond. The key idea is not about depth or the end of a buoy system, but about the area around the mark being safe to navigate in any direction. That’s why this mark is best interpreted as indicating the entrance to the channel.