vertical datum standard names North American Vertical Datum 1988 NAVD88 National Geodetic Vertical Datum 1929 NGVD29 Mean Lower Low Water MLLW Mean Low Water MLW/> Local Mean Sea Level, also coded as MSL LMSL MTL Diurnal Tide Level DTL Mean High Water MHW Mean Higher High Water MHHW North American Datum 1986 NAD83 WGS84G1150 WHS84G873 WGS84G730 WGS84ORIG/> WGS72 ITRF2000 incomplete. ITFR97 ITRF96 ITRF94 ITRF93 ITRF92 ITRF91 incomplete. ITRF90 ITRF89 ITRF88 SIOMIT92 NEOS90 PNEOS90