Knowledge of shipping movements delivers commercial advantage, and the disposition of ships at sea is vitally important when organising rescue efforts. In the last decade, such information has become valued in counter terrorist activity; it was primarily this factor that drove the implementation of AIS and LRIT (long-range identification and tracking). The scope of AIS was initially limited to the small VHF footprints around vessels and to coastal areas with the necessary shore-based infrastruc....

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