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  2. Fog bell - Wikipedia

    en.wikipedia.org/wiki/Fog_bell

    OpenSeaMap sea chart showing a port buoy and a west cardinal, an indicator for a sound signal and the label Bell [4] A bell buoy is a floating sea mark with a bell that is made to sound by the swell. It belongs to the sound buoys and by shape to the beacon buoys. [5] [6] In nautical charts, bell buoys are designated Bell. The development of ...

  3. Foghorn - Wikipedia

    en.wikipedia.org/wiki/Foghorn

    Foghorn made with a marine shell, with a hole on its narrowest side An early form of fog signal: the fog bell at Fort Point Light Station, Maine. Audible fog signals have been used in one form or another for hundreds of years, initially simply seashell horns, fog bells or gongs struck manually.

  4. File:GMRS and FRS Frequency Spectrum Chart.svg - Wikipedia

    en.wikipedia.org/wiki/File:GMRS_and_FRS...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  5. International Code of Signals - Wikipedia

    en.wikipedia.org/wiki/International_Code_of_Signals

    (See chart to the right.) Combinations of these alphanumeric characters are assigned as codes for various standardized messages. For instance, the master of a ship may wish to communicate with another ship, where their own radio may not be working or the other ship's call sign is not known or the other ship may not be maintaining a radio watch.

  6. Marine VHF radio - Wikipedia

    en.wikipedia.org/wiki/Marine_VHF_radio

    Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.

  7. Template:Frequency list - Wikipedia

    en.wikipedia.org/wiki/Template:Frequency_list

    To change this template's initial visibility, the |state= parameter may be used: {{Frequency list | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Frequency list | state = expanded}} will show the template expanded, i.e. fully visible.

  8. Vehicle horn - Wikipedia

    en.wikipedia.org/wiki/Vehicle_horn

    Diagram showing how a car horn works. A horn grille is a part of some designs of car or other motor vehicle that has an electric horn, such as a motor scooter. Larger, louder air horns, as found on trucks (lorries) and buses, are driven by air compressors, or supplied by reservoirs charged to operate their air brakes. The compressor forces air ...

  9. Global Maritime Distress and Safety System - Wikipedia

    en.wikipedia.org/wiki/Global_Maritime_Distress...

    DSC is primarily intended to initiate ship-to-ship, ship-to-shore and shore-to-ship radiotelephone and MF/HF radiotelex calls. DSC calls can also be made to individual stations, groups of stations, or "all stations" in one's radio range. Each DSC-equipped ship, shore station and group is assigned a unique 9-digit Maritime Mobile Service Identity.