Extract from notice to mariners, February 19, 1875
Extract from notice to mariners.
Every steamer, when under way, shall use a steam-whistle. Sailing-vessels, and all other craft propelled by sails, shall use a fog-horn.
Whenever there is a fog, whether by day or night, the fog-signals described below shall be sounded.
Sailing-vessels, and every craft propelled by sails, upon the ocean, lakes, and rivers, shall, when on their starboard tack, sound one blast of their fog-horn; when on their port tack, they shall sound two blasts of their fog-horn; when with the wind free or running large, they shall sound three blasts of their fog-horn; when lying to, or at anchor, they shall sound a general alarm. In each instance, the above signals shall be sounded at intervals of not more than two minutes.
Sailing-vessels, when not under weigh, and anchored or moored in the channel or fairway of commerce, shall sound the general-alarm signal at intervals of not more than two minutes; and all steamers navigating in a fog or thick weather, shall, by the rules governing pilots, sound their steam-whistle at intervals of not more than one minute.