What is the definition of shoal water in navigational terms?

The definition of shoal water in navigational terms refers to water depths that are shallow enough to pose a risk to navigation. The term typically indicates areas where vessels might encounter difficulties, especially if they require a certain minimum depth to safely transit.

In this context, the defining threshold for shoal water is established at Mean Lower Low Water (MLLW) of 18 feet or less. This is significant for navigators as it highlights where caution is required and helps in making decisions related to safe passage. It informs mariners that with depths at or below this level, vessels could potentially be at risk of running aground, necessitating careful planning and vigilance while navigating these waters.

The choice reflecting shoal water is thus connected to ensuring safety and effective navigation, as understanding these definitions aids in route planning and hazard avoidance.