Although many of the vertical datum transformations between the North America Vertical Datum of 1988 (NAVD 88) and mean sea level, and between mean sea level and the other tidal datums, are based on tidal values from the present National Tidal Datum Epoch (NTDE, 1983 to 2001), some are based on data from older tidal epochs. NOAA / NOS is in the process of updating the data in VDatum to conform to the latest NTDE. In the mean time, care should be used when applying these transformations.
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