Red sectors of navigation lights warn mariners of __________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — shoals or nearby land
Red sectors in navigation lights are specifically designed to alert mariners to danger areas, such as shoals, wrecks, or nearby land. Per the USCG Light List and IALA guidelines, these sectors indicate that a vessel is approaching a hazard and must alter course to remain in the safe white sector.
100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.