Definition
Charted alongside the light characteristic and abbreviated by type: Horn, Siren, Bell, Whistle, Gong or Dia for diaphone. A period is often given, such as Horn(2)30s, meaning two blasts every thirty seconds. Sound in fog is unreliable for bearing because refraction, wind shear and the vessel's own noise create silent sectors, so a fog signal should be treated as confirmation that a mark is somewhere near, never as a bearing.
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