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The marine surveying is one of the branches of geomatics, and the sea navigational affairs project construction belongs to the marine surveying application category. The advent of GPS technology creates a new high-tech avenue for marine surveying. This paper mainly discussed the application of GPS-RTK technologies in marine surveying. Taking the project of Yangkou man-made island in Nantong city as an example, it was introduced that the main job and work procedure of GPS technologies in under-water survey and steel sheet pile implementing the localization. Problems need to be cared during the procedure and how to solve them also were being discussed. And also some beneficial experiences of GPS technology applying in marine surveying were summarized.
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