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2. Digital selective calling - Wikipedia

   en.wikipedia.org/wiki/Digital_Selective_Calling

   A Distress DSC call is called an Alert. Urgency, Safety and Routine are called Announcements. Class A VHFs, used on commercial ships, have the ability to send distress, distress relay, all ships urgency, all ships safety, individual, group, geographic area and telephone alerts/announcements on DSC channel 70 (Digital channel reserved for DSC ...

3. Global Maritime Distress and Safety System - Wikipedia

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

   DSC distress alerts, which consist of a preformatted distress message, are used to initiate emergency communications with ships and rescue coordination centers. DSC was intended to eliminate the need for persons on a ship's bridge or on shore to continuously guard radio receivers on voice radio channels, including VHF channel 16 (156.8 MHz) and ...

4. Distress signal - Wikipedia

   en.wikipedia.org/wiki/Distress_signal

   A distress signal can be three fires or piles of rocks in a triangle, three blasts on a whistle, three shots from a firearm, or three flashes of light, in succession followed by a one-minute pause and repeated until a response is received.

5. Mayday at sea: How fishermen rely on distress calls for life ...

   www.aol.com/news/mayday-sea-fishermen-rely...

   Fishermen rely on mayday calls for emergency help at sea —know how to make one when needed.

6. International distress frequency - Wikipedia

   en.wikipedia.org/wiki/International_distress...

   For much of the 20th century, 500 kHz was the primary international distress frequency. Its use has been phased out in favor of the Global Maritime Distress Safety System. Use of some distress frequencies is permitted for calling other stations to establish contact, whereupon the stations move to another frequency.

7. Rescue 21 - Wikipedia

   en.wikipedia.org/wiki/Rescue_21

   It was created to better locate mariners in distress and save lives and property at sea and on navigable rivers. To address the limitations of the current communications system, the National Distress and Response System (NDRS), the Coast Guard has implemented a major systems acquisition program entitled Rescue 21.