Global Positioning System Reference
In-Depth Information
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U.S. Coast Guard's maritime differential GPS service and incorporated the ground
wave emergency network (GWEN) sites, which became available at the end of the
cold war (Allen, 1999; Cook, 2000). NDGPS utilizes powerful ground transmitters
to broadcast the corrections.
As the coverage area of a WADGPS further increases, it eventually will become a
global system, being conceptually similar to the one discussed in Section 7.6.
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