Navigation General · Aids to Navigation — Sound Signals
A sound signal fitted to a buoy or light station (horn, bell, gong, whistle) is provided primarily to:
- AAid identification and warning in reduced visibility✓ Correct
- BEntertain passengers
- CMeasure depth
- DCharge the buoy battery
Explanation
Audible aids help mariners locate and identify aids to navigation in fog or darkness. Wave-actuated bells/gongs/whistles on buoys may be silent in calm conditions, so they must not be relied on as a sole means of position.
Authority: Light List
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