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 ?
The basic idea of this method is that the improved threshold is selected as the dividing line between the temperature trend item and other noise signals, thus avoiding the phenomenon of wavelet coefficients of the "overkill" and "overreservation." The experimental FOG signal is processed by the improved threshold and the results show that the proposed method effectively avoids the deficiency above.
Most stations had a keeper and one to five assistants; stations with a fog signal had more assistants.
"The fog came in and they could hear the fog signals. The RAF helicopter homed in on them and slowly crept to the jetskis.
Police in West Mercia warned last night that railway fog signals stolen from a Midland tourist attraction were potentially lethal.