Which type of mark signifies the end of a channel and indicates safe water ahead?

The type of mark that signifies the end of a channel and indicates safe water ahead is known as a Safe Water Mark. These marks are designed to provide navigational guidance by indicating areas of safe water, particularly at the entrance to a channel. Safe Water Marks are typically cylindrical and painted with red and white stripes. They may also have a topmark in the form of a ball.

These marks help mariners understand that they are transitioning from a possibly restricted channel into open water, where it is safe to navigate. The visual characteristics of Safe Water Marks, along with their established meanings within the IALA buoyage system, are crucial for maritime safety as they help prevent grounding and ensure efficient navigation.

In contrast, Cardinal Marks indicate safe water but provide information related to the geographic position regarding hazards. Lateral Marks indicate the port or starboard sides of a channel and are not necessarily related to the end of a channel. Special Marks are used to convey specific information or indicate special areas, which do not specifically denote safe water ahead.