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National Distress System
The U.S. National Distress System (NDRS) was established more than 30 years ago as a VHF-FM-based radio communication system that has a range of up to 20 nautical miles (40 km) along most of the U.S. shoreline for the United States Coast Guard. While this system has served the Coast Guard well over the years, it consists of out-of-date and non-standard equipment with many limitations. This system is being replaced by Rescue 21.
==Overview==
The Coast Guard currently operates a National Distress System, a network of about 300 VHF transceivers and antenna high-sites which are remotely controlled by regional communications centers to provide coverage extending out to at least 20 nautical miles from shore, and often much further. Coverage is reasonably continuous through most of the Atlantic, Gulf and Pacific Coasts, the Great Lakes, and many rivers. Many urban areas of the U.S. are also covered.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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