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| description: | Global Positioning System (GPS) satellite navigation validation marks are unique visible markers located at a number of public boat ramps and associated jetties, which mariners or owners of portable GPS units can use to validate their position and map datum settings. License: Creative Commons Attribution Tags: GPS, Validation Mark Contact: sharon.hu@transport.wa.gov.au |
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| title: | GPS Validation Mark (DOT-031) |
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| culture: | en-US |
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