š Key Concepts
ā¢ Rule 30 ā Anchored Vessels and Vessels Aground (Navigation Rules)
ā¢ Day shapes for vessels aground versus restricted in ability to maneuver (RAM) and towing
ā¢ How many shapes are displayed, and in what pattern (vertical line, triangle, single shape, etc.)
š Think About
ā¢ First, recall exactly what day shapes a vessel aground must display. How many shapes are there, what are they, and how are they arranged?
ā¢ Next, think about each listed vessel type and recall its normal day shapes: does it use the same number of shapes in a straight vertical line, or a different pattern?
ā¢ Ask yourself whether any of the listed vessels uses a vertical string of the same shapes, or whether they use combinations (like ballādiamondāball) or different arrangements.
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Before You Answer
ā¢ Verify from Rule 30 what the day shape for a vessel aground is (number of balls and their arrangement).
ā¢ For towing a submerged object, verify whether the shape is a ball, a diamond, or a combination ā and how many.
ā¢ For dredging or hydrographic survey vessels, confirm if they are treated as restricted in ability to maneuver (RAM) and what that RAM day shape pattern is (ballādiamondāball or something else).