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2. 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.

3. Very high frequency - Wikipedia

   en.wikipedia.org/wiki/Very_high_frequency

   VHF radio waves propagate mainly by line-of-sight, so they are blocked by hills and mountains, although due to refraction they can travel somewhat beyond the visual horizon out to about 160 km (100 miles). Common uses for radio waves in the VHF band are Digital Audio Broadcasting (DAB) and FM radio broadcasting, television broadcasting, two-way ...

4. High frequency - Wikipedia

   en.wikipedia.org/wiki/High_frequency

   The upper section of HF (26.5-30 MHz) shares many characteristics with the lower part of VHF. The parts of this section not allocated to amateur radio are used for local communications. These include CB radios around 27 MHz, studio-to-transmitter (STL) radio links, radio control devices for models and radio paging transmitters.

5. Radio spectrum - Wikipedia

   en.wikipedia.org/wiki/Radio_spectrum

   2182 kHz is a medium-wave frequency still used for marine emergency communication. Marine VHF radio is used in coastal waters and relatively short-range communication between vessels and to shore stations. Radios are channelized, with different channels used for different purposes; marine Channel 16 is used for calling and emergencies.

6. Digital selective calling - Wikipedia

   en.wikipedia.org/wiki/Digital_Selective_Calling

   A Sailor VHF DSC unit. Digital selective calling (DSC) is a standard for transmitting predefined digital messages via the medium-frequency (MF), high-frequency (HF) and very-high-frequency (VHF) maritime radio systems. It is a core part of the Global Maritime Distress Safety System (GMDSS). [1]

7. Shipping Forecast - Wikipedia

   en.wikipedia.org/wiki/Shipping_Forecast

   The Shipping Forecast should not be confused with similar broadcasts given by HM Coastguard to vessels at sea tuned into marine VHF and MF radio frequencies. HM Coastguard's broadcasts can only be heard by vessels or persons using or tuned into marine VHF and MF radio frequencies, whereas the Shipping Forecast can be heard by anyone tuned into ...