A quick flashing light means

• A. Anchorage area
• B. Safe water
• C. Frequent sound signals
• D. Indicates preferred channel or danger

Answer: (D)

A quick flashing light is used to convey a navigational cue that helps you pick the right path or avoid hazards. The rhythm is designed to grab attention and mark something important on the waterway—often a preferred channel that mariners should follow, or a danger area to steer clear of. It isn’t a signal for anchorage or simply a general warning; other cues (like symbols or different patterns) handle safe water or anchorage indications, and sound signals (bells or horns) are separate aids. So the purpose of this light pattern is to indicate the designated channel to use or the presence of a hazard, guiding you through the water safely.