
Sound signals are used when lights and other sea marks are obscured, assisting the mariner when vision is limited[1]. Coast fog-signals provide information to mariners, and allow them to continue their voyage with comparative safety, even when visibility is low[1].
Without fog signals, buoys, beacons, and other signs of the sea are rendered useless[1]. The anxious mariner can get a warning in time to enable him to alter his course, and probably save his vessel[1]. The development of sound signals is for the obscured lights and hidden seamarks[1].
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