🔍 Key Concepts
• Navigation Rules Rule 30 – Anchored Vessels and Vessels Aground (day shapes)
• Difference between a ball, a diamond, and cones used as day shapes
• When day shapes are required for vessels at anchor vs. vessels engaged in special operations (towing, fishing, etc.)
💭 Think About
• Look at each option and name what type of day shape it is normally used for (for example: fishing, towing, constrained by draft, at anchor, etc.). Which one is associated with an anchored vessel?
• Ask yourself: which situation is the simplest, just indicating that the vessel is not making way but simply lying at anchor, with no special operations?
• Compare the shapes used for fishing and towing to the shapes in the options—can you eliminate those shapes that clearly indicate some special activity other than just being at anchor?
✅ Before You Answer
• Verify in Rule 30 which single geometric shape is required in the fore part of a vessel at anchor during the day
• Confirm that shapes involving two cones together or a diamond are associated with towing or fishing, not a plain anchored vessel
• Make sure the choice you pick shows only one simple shape, not a combination that would indicate a special condition