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Mean Sea Level

ChuckTurlington

All,

I am using ArcMap 10.4.1.

I see many engineers using MSL, but I believe, should be using NAVD88 as a vertical datum. I imagine there must be a rule of how many miles upland (distance from gauge) the sea level gauge is good for. Does anyone know how far upland one can make use of Mean Sea Level accurately, before having to switch to NAVD88 or similar?

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