General Navigation USCG Question #1867 (Set 58)

If several navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List?

Official USCG Answer & Rule Citation

Correct Answer: Option D — Intensity

Navigational light characteristics in the USCG Light List include period, rhythm, and color. Intensity is excluded because it varies significantly with atmospheric visibility, observer distance, and ocular fatigue, making it unreliable for positive light identification.

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