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What does gravity have to do with sea level?
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[QUOTE="mark2142, post: 6645310, member: 702249"] (I found this. Hope these links are right. [URL]https://www.usgs.gov/faqs/what-geoid-why-do-we-use-it-and-where-does-its-shape-come[/URL] [URL]https://www.gpsworld.com/data-collection-of-wgs-84-information-or-is-it/[/URL]) Lets say this WGS84 reference system and the WGS84 geoid or imaginary equipotential ball is defined by the scientists. So is our GPS encoded with it and tells us our height or it communicates with the satallite where this model is stored? [/QUOTE]
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What does gravity have to do with sea level?
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