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and Japan's QZSS.
* Continental-scale Ground-Based Augmentation Systems (GBAS); for example, the Australian GRAS and the joint US Coast Guard, Canadian Coast Guard, US Army Corps of Engineers and US Department of Transportation National Differential GPS (DGPS) service.
* Regional-scale GBAS such as CORS networks.
* Local GBAS typified by a single GPS reference station operating Real Time Kinematic (RTK) corrections.

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