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On February 1, 1992, the revision of the "International Convention for
the Safety of Life at sea, 1974" took effect and GMDSS was introduced around
the world.
Replacing previous safety communication systems using the Morse code, it
has made possible appropriate and speedy search and rescue operations, with
the use of radio waves which can travel a wide distance via satellite, which
enable ships to send SOS to land from any part of the sea, and sea safety information
from ground to be clearly received.
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