Когда прочитал эту информацию, ото сразу полез "в святцы" - посмотреть реальную карту передвижения торговых и других судов по мировому океану
на сайте "MarineTraffic.com" в разделе "Life Map".
Картина открылась тревожно-удручающая - мировой океан свободен(!) от торговых судов(!). Все они жмутся по берегам Атлантики и Тихого с Индийским океанов
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:-)
А вообще, конечно, верится с трудом...
Западная экономика, если верить аналитикам, росла весь год же!
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How are vessel positions recorded?
The system is based on AIS (Automatic Identification System). As from December 2004, the International Maritime Organization (IMO) requires all vessels over 299GT to carry an AIS transponder on board, which transmits their position, speed and course, among some other static information, such as vessel’s name, dimensions and voyage details.
What is AIS?
"Normally, vessels with an AIS receiver connected to an external antenna placed on 15 meters above sea level, will receive AIS information within a range of 15-20 nautical miles. Base stations at a higher elevation, may extend the range up to 40-60 NM, even behind remote mountains, depending on elevation, antenna type, obstacles around antenna and weather conditions. The most important factor for better reception is the elevation of the base station antenna. The higher, the better. We have seen vessels 200 NM away, with a small portable ( ... )
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http://kajaleksei.livejournal.com/40831.html
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