What is the meaning of a white can buoy?

A white can buoy signifies a safe water mark, which is crucial for maritime navigation. In the Aids to Navigation system, safe water marks indicate that there is navigable water all around the buoy, allowing mariners to safely pass on either side. This is particularly important for vessels navigating in waters that may have shallow areas or potential hazards nearby. The buoy's color and shape are standardized, making it recognizable to mariners.

The other options, while related to navigation, do not represent the specific meaning associated with a white can buoy. For example, fishing zones are not typically marked by white can buoys; boating hazards are often indicated by other colored buoys; and emergency signals would use distinct forms and markings to convey urgency or danger. Recognizing the purpose of different buoy types is essential for safe navigation on the water.