🔍 Key Concepts

• Rule 3(l) – Definition of Restricted Visibility in the Navigation Rules • Examples of conditions that can reduce visibility at sea (weather, environment, time of day) • Difference between a specific distance limit and a general condition description

💭 Think About

• Ask yourself: Does the Rules definition of restricted visibility name just one specific cause (like fog) or does it cover a broader set of situations? • Consider whether the Rules tie restricted visibility to an exact distance in miles, or describe it more generally. • Think about real-world examples: would heavy rain at night or sandstorms at sea be treated the same as fog under this definition?

✅ Before You Answer

• Check whether the definition in Rule 3(l) mentions only fog or lists any condition that reduces visibility. • Verify if the Rule uses a specific distance (e.g., 1/2 mile) or no fixed distance at all. • Confirm that the wording in the Rules focuses on the effect on visibility, not whether you can see shore.