The tags defined on this page will render in various nautical charts. This page defines tags for the attributes of fog signals.
||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.
||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.
||The signal is generated by a manually operated mechanism such as a hand cranked siren.
||The signal is generated by the motion of air such as a wind driven whistle.
|Value of maximum range (VALMXR)
||The maximum range at which the signal can be heard in nautical miles.
|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.
OSM seamark resources
- S-101 ENC/iENC registry (iho.int), the ENC Data Classification and Encoding Guide (DCEG) can be downloaded as zipped PDF, online access to symbols in Portrayal Register
- International nautical chart symbol legend (Chart INT-1, NOAA)
- Encoding Guide for Inland ENCs (openecdis.org, 2018), an international standard of the Inland ENC Harmonization Group is currently in development (IEHG Publication S-401, 2019)
- European Code for Inland Waterways (CEVNI), (UNECE, Fifth revised version 2015)
- European Code for Signs and Signals on Inland Waterways (SIGNI), (UNECE Resolution N0. 90, 2018)
- U.S. Aids to Navigation System – also details the Western Waters Marking System, Intracoastal Waterway system, and Uniform State Waterway Marking System