Which navigational zone refers to waters within 1 NM of shoal, land, or hazards?

The correct choice identifies the navigational zone known as "Restricted Waters," which refers specifically to areas of water that are typically shallower and may contain hazards such as shoals, land, and other obstructions within 1 nautical mile. This zone is crucial for mariners to be aware of because navigational rules and practices in restricted waters significantly differ from those in deeper, more open waters.

Navigating in restricted waters often requires heightened vigilance due to the increased likelihood of encountering hazards that can impact vessels. Vessels operating in these areas must adhere to specific guidelines to ensure safety, including maintaining a proper lookout and using sound signals where appropriate. Being aware of this zone is essential for ensuring safe navigation and preventing groundings or collisions.

The other mentioned options, while related to maritime navigation, do not accurately describe the specific characteristics that define restricted waters. Coastal waters, for instance, may include a broader range of areas but do not specifically imply proximity to hazards in the same way as restricted waters do. Open ocean and deep waters refer to areas that are typically more navigable and less fraught with dangers compared to restricted waters.