fog signal


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fog signal

[′fäg ‚sig·nəl]
(navigation)
A warning signal transmitted by a vessel or aid to navigation during periods of low visibility.
The device for producing such a signal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Deal with the FOG signal by discrete wavelet transform and obtain the wavelet coefficients of each scale; then process wavelet coefficients with the improved threshold which has been presented in previous step.
The fog signal was discontinued in 1987 and the station was automated the following year.
The automated fog signal sounds every 30 seconds between October 1 and April 1, but this time of year, East Brother Light Station is a quiet retreat from the bustle of the mainland.
During the Easter weekend, adventurous art lovers will be beating a path to see the work of artist Philippa Jacobs at her isolated home and studio at the 19th century fog signal station at North Stack on Anglesey.
But the buyer might require some earplugs during foggy weather when the fog signal is sounded every 45 seconds.
Inside the van were 10 railway fog signal detonators in a box marked "explosives".
Most stations had a keeper and one to five assistants; stations with a fog signal had more assistants.
Visitors can also tour the Boathouse Museum and fog signal building, which expand and enhance your Great Lakes maritime history experience.
There is also an automatic fog detector which starts a fog signal should the visibility drop to less than two and a half miles.
Our route bends down the slope and, after a flight of steps, we pass the Whitby Fog Signal. A kissing gate leads to a roadway and, after crossing the wall on the opposite side, we follow the well marked Cleveland Way past the fog horn.
A spokeswoman said: "No decision will be taken to remove the fog signal without the approval of our users - the mariner."