Datum Update

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Datum Order Change

The order of the datums, tidal ranges, and mean time intervals output from the "Accepted Datums" and "Monthly Mean" data listings changed on July 17th, 2001 to a more representitive order (see image below). The new order is as following:


MHHW      --   Mean Higher High Water 
MHW       --   Mean High Water 
DTL       --   Mean of MHHW and MLLW
MTL       --   Mean of MHW and MLW
MSL       --   Mean Sea Level
MLW       --   Mean Low Water		 
MLLW      --   Mean Lower Low Water                       
GT        --   Difference between MHHW and MLLW                              
MN        --   Difference between MHW and MLW
DHQ       --   Difference between MHHW and MHW
DLQ       --   Difference between MLW  and MLLW
HWI       --   Greenwich Mean High Water Interval in Hours
LWI       --   Greenwich Mean Low  Water Interval in Hours

MHHW  MHW  DTL  MTL  MSL  MLW  MLLW  GT  MN  DHQ  DLQ  HWI  LWI

Click for larger image

If you have an questions or concerns about the about the datum order change contact the Webmaster.