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Under Rule 30 — Anchored Vessels and Vessels Aground, what should a navigator remember?
A
Rule 20 establishes when lights and shapes must be displayed.
B
All-round light covers full 360 degrees.
C
For vessels 12 metres to under 50 metres: masthead light 5 miles (3 miles if under 20m), sidelight 2 miles, sternlight 2 miles.
D
The anchor day shape is one black ball.