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The International Hydrographie Organisation recommends that Lowest Astronomical Tide (LAT) to be adopted as the international Chart Datum. Many hydrographie offices, like SHOM in France, have now adopted this recommendation. A new approach to fix chart datum and rectify bathymetric surveys depth measurements will be presented. Tt is based on modem space techniques, including GPS, lowest astronomical tide calculation and mean sea level ellipsoidal heights. This subsequent chart datum can then be considered as heights related to a weIl defined and maintained global geodetic reference frame like ITRF.

Détermination du zéro hydrographique dans un système de référence terrestre mondial