Which type of buoy might be used to provide information about an underwater hazard?

The special mark buoy is specifically designed to convey information about particular features or areas such as underwater hazards, which may not be represented by a navigational aid that indicates safe or unsafe waters. These buoys are typically used to mark designated areas such as anchorages, no-entry zones, or obstructions, ensuring that mariners are aware of potential dangers beneath the surface.

Unlike safe water buoys, which indicate that there is navigable water all around, or lateral buoys, which define the edges of a channel, the special mark buoy serves a unique purpose geared towards alerting mariners to specific situations or risks, including underwater hazards. Cardinal buoys also have a specific role in navigation, indicating the safe water location in relation to hazards but do not serve the same function as the special mark buoy to denote specific underwater dangers directly.

Overall, the function of the special mark buoy makes it an essential tool in maritime navigation for keeping vessels safe from hidden threats beneath the water's surface.