USCG Exam Practice · Danger bearings and danger circles
A sectored light displays different colors in defined arcs of bearing. What is the primary navigational purpose of observing which color sector your vessel is in?
- ATo determine the light's nominal range
- BTo identify the light's characteristic period
- CTo indicate whether the vessel is in safe or danger water✓ correct
- DTo determine the distance off the light by color intensity
Why C is correct
Per the Light List, a sectored light shows different colors in defined arcs of bearing, and the mariner's bearing through the sectors indicates safe versus danger water. The color observed tells the mariner which sector — and therefore which water — the vessel is transiting.
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