Marine transportation is vital to the economic well-being of the United States. The capability of periodic automatic communications of precise vessel position and course over ground information in controlled waters such as harbors and high density shipping corridors provides a key ingredient to improved safety of the public and the protection of the environment. This capability provides for real-time management of the waterways, to provide timely alerts that can be used to prevent catastrophic incidents (such as the Exxon Valdez grounding), as well as, to provide quick and effective responses to control and mitigate those incidents that do occur.


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