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Replies
Geoid model is the sea level without any influence from any tides, winds and undercurrent. It is the mathematical model of the sea due to the influence of gravity only. However for the mean sea level(msl). It is the observations taken at the gauges over a period of time, this observation of the tide could be affected by the wind, tides, undercurrent or even passing ships.
Hope this helps and correct me if I am wrong. Cheers!
https://www.google.com/search?q=geoid&ie=UTF-8&oe=UTF-8&...
See this video,
http://m.youtube.com/watch?v=q65O3qA0-n4&desktop_uri=%2Fwatch%3...