General Navigation USCG Question #1024 (Set 32)

The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?

Official USCG Answer & Rule Citation

Correct Answer: Option C — 059°

The radar bearing is 056° PGC. To convert to true, apply the gyro error: 056° + 2°E = 058° True. However, the beam width effect requires adding half the beam width (1°) to the left tangent, resulting in a corrected bearing of 059° True for plotting the target's center on the chart.

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