Available languages — Key:seamark:fog signal:period
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The tags defined on this page will render in various nautical charts.
This page defines tags for the attributes of fog signals.
|| S100 code
| Fog signal
|| A warning signal transmitted by a vessel, or aid to navigation, during periods of low visibility. Also, the device producing such a signal.
This page defines values for the "seamark:fog_signal:category" tags and other attributes applied to fog signals.
| Category (CATFOG)
|| A signal produced by the firing of explosive charges.
|| A diaphone uses compressed air and generally emits a powerful low-pitched sound, which often concludes with a brief sound of suddenly lowered pitch, termed the 'grunt'.
|| A siren uses compressed air and exists in a variety of types which differ considerably in their sound and power.
|| A horn having a diaphragm oscillated by electricity
|| A reed uses compressed air and emits a weak, high pitched sound.
|| A diaphragm horn which operates under the influence of compressed air or steam
|| A ringing sound with a short range.
|| A distinctive sound made by a jet of air passing through an orifice.
|| A sound produced by vibration of a disc when struck.
|| A horn uses compressed air or electricity to vibrate a diaphragm and exists in a variety of types which differ greatly in their sound and power. The classification 'horn' is the generic term for fog signals `nautophone`, `reed` and `tyfon`.
| Signal generation (SIGGEN)
|| Signal generation is initiated by a self regulating mechanism such as a timer or light sensor.
| By wave action
|| The signal is generated by the motion of the sea surface such as a bell in a buoy.
| By hand
|| The signal is generated by a manually operated mechanism such as a hand cranked siren.
| By wind
|| The signal is generated by the motion of air such as a wind driven whistle.
|| Value type
| Value of maximum range (VALMXR)
|| The maximum range at which the signal can be heard.
| Signal frequency (SIGFRQ)
|| The frequency of the sound signal, in Hertz.
| Signal group (SIGGRP)
|| The number of consecutive sounds, or the morse character(s) within one period of full sequence.
| Signal period (SIGPER)
|| Time of the time occupied by an entire cycle of intervals of sound and silence.
| Signal sequence (SIGSEQ)
|| The sequence of times occupied by intervals of sound and silence.
Seamark Tag Values
INT-1 Cross Reference