General Navigation USCG Question #947 (Set 30)

Your radar displays your ship off center. As you proceed on your course, your ship's marker moves on the PPI scope while echoes from land masses remain stationary. What is this display called?

Official USCG Answer & Rule Citation

Correct Answer: Option A — True motion

True motion displays show the vessel and other targets moving across the PPI scope in their true geographic positions. Land masses remain stationary because their coordinates are fixed, while the ship's marker moves across the screen, providing the navigator with a clear representation of the vessel's actual movement over ground.

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