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Google earth uses the EGM96 geoid as it's reference for altitude/depth. EGM96 is a model of the ocean surface that takes into account the fact that the earth isn't a sphere, and some account of regional variation in gravity. So the number is the difference between the sea floor and the ocean surface (geoid) at that point. WGS84, the system used by GPS, has a ...


This is the elevation of the ocean floor, which is the negative of the depth.


This is the ocean depth at that point, according to the Google Earth database.

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