CATFOG
- explosive: a signal produced by the firing of
explosive charges. (Admiralty List of Lights and Fog Signals)
- diaphone: 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'. (Admiralty List of Lights and Fog Signals)
- siren: a siren uses compressed air and exists
in a variety of types which differ considerably in their sound and power. (Admiralty List
of Lights and Fog Signals)
- nautophone: a horn having a diaphragm
oscillated by electricity (IHO Dictionary, S-32, 5th Edition, 3371).
- reed: a reed uses compressed air and emits a
weak, high pitched sound. (Admiralty List of Lights and Fog Signals)
- tyfon: a diaphragm horn which operates under
the influence of compressed air or steam (IHO Dictionary, S-32, 5th Edition, 5717).
- bell: a ringing sound with a short range. The
apparatus may be operated automatically, by hand or by wave action. (IHO Chart
Specifications, S-4, 452.5)
- whistle: a distinctive sound made by a jet of
air passing through an orifice. The apparatus may be operated automatically, by hand or by
air being forced up a tube by waves acting on a buoy. (IHO Chart Specifications, S-4,
452.6)
- gong: a sound produced by vibration of a disc
when struck. The apparatus may be operated automatically, by hand or by wave action. (IHO
Chart Specifications, S-4, 452.7)
- horn: 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. (Admiralty List of Lights and Fog Signals)