HAT - the highest tidal level which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions (IHO Dictionary, S-32, 5th Edition, 2244).
høyesteAstronomiskeTidevann
LAT - the lowest tide level which can be predicted to occur under average meterological conditions and under any combination of astronomical conditions. (IHO Dictionary, S-32, 5th Edition, 2936).
lavesteAstronomiskeTidevann
LLW - the average height of the lower low waters at a place over a 19-year period
middelHøydeAvLavesteLavvann
MHW - the average height of all high waters at a place over a 19-year period
middelHøyvann
HWS - the average height of the high waters of spring tides. Also called spring high water
middelHøyvannVedSpring
MLW - the average height of all low waters at a place over a 19-year period
middelLavvann
MLWS - the average height of the low waters of spring tides. Also called spring low water
middelLavvannVedSpring
MSL - the average height of the surface of the sea at a tide station for all stages of the tide over a 19-year period, usually determined from hourly height readings measured from a fixed predetermined reference level
middelvannMiddelvannsnivå