What type of light rhythm indicates Safe Water Marks?

A Safe Water Mark, used to indicate safe water and often to mark the centerline of a channel, typically features a special light rhythm. The standard light characteristic for Safe Water Marks is a "luminous" signal, specifically characterized by the use of a simple flash or group of flashes.

The rhythmic flashing you would see on these buoys is specifically identified by a group flash pattern, which consists of two distinct flashes occurring in a quick succession, typically labeled as "Group Flashing (2)." This pattern helps mariners easily recognize the buoy and discern the navigational mark from other types, allowing for clear identification of safe waters.

The other options represent different light rhythms that are not associated with Safe Water Marks. For instance, the steady flashing at a consistent rate would typically indicate a special light mark or other buoy types. Similarly, variations like VQ(3) or Q(6) represent other buoy characteristics with differing flash rates and durations that are intended for marking specific navigational features or information, not specifically for safe water.

In summary, the Group Flashing (2) characteristic distinctly marks Safe Water, providing mariners with a reliable way to navigate safely through challenging waters.