Sep 18, 2023 · The Global Maritime Distress and Safety System (GMDSS) is an international system relating to all vessels over 300 gross tonnes and all passenger vessels engaged on international voyages, irrespective of tonnage. The Maritime industry operates on the VHF (Very High Frequency). 8 MHz) for short range maritime use 406 MHz to 406. This system, which the world's maritime nations - including the United States - have implemented, is based upon a combination of satellite and terrestrial radio services and has changed international distress communications from being primarily ship-to-ship-based to primarily ship-to-shore-based (Rescue Coordination Center). 2 182 kHz on MF, channel 16 on VHF, while waiting for the DSC distress acknowledgment. Used for radio telephony (voice) distress calls and messages. Twelve hour, (0700-1900 hrs) 7-day monitoring of the International Distress and Calling frequencies of 4125, 6215 and 8291 kHz for distress calls from vessels. International distress frequencies are specific radio frequencies designated for distress calls. It is used for distress and emergency calls as well as for informational broadcasts from the Coast Guard. Note: The 500 kHz International Distress and Calling Frequency for Radio Telephony has been replaced by the Global Maritime Distress and Safety System (GMDSS) since 1999.

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