الفهرس 
Introduction and Methodological FrameworkOnly 14 pages are availabe for public view
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Abstract
Nautical charts are indispensable for ensuring safe and efficient navigation across global waterways. The accuracy of these charts, particularly in terms of nautical chart datums, is paramount for the safeguarding of maritime vessels and the facilitation of precise navigation. Furthermore, the ongoing process of updating and validating nautical chart data holds critical significance for authorities and decision-makers, empowering them to make well-informed and accurate judgments in maritime operations. Because of the variations in sea levels brought on by climate change and land subsidence, regular updates are necessary. This research aims to calculate tidal levels at the southern entrance of the Suez Canal in Port Tawfik using hourly sea level data measured within the port area for four years. Harmonic analysis was implemented to separate tidal and non-tidal components of sea level using (Geo-tide software). The algorithm showed that the dominant tidal constituents in the area are M2, S2, K1, and O1 with amplitudes equal (0.551 m, 0.143 m, 0.036 m, and 0.011 m), respectively, and phase angles of (330.57°, 0.45°, 183.05°, and 199.35°), respectively. These components are fundamental in tidal datum calculations. Moreover, results showed that the calculated values of highest high-water level, lowest low-water level, mean high water springs, mean low water springs, mean high water neaps, mean low water neaps, highest astronomical tide, and finally lowest astronomical tide to be as follows; (19.11 m, 17.63 m, 19.06 m, 17.67 m, 18.78 m, 17.96 m, 19.37 m, and 17.37 m), respectively, referred to the Suez Canal authority datum. Furthermore, a safety margin of (± 0.10 m) was added to all estimated values, as the Naval Recruiting and Training Agency recommended. Finally, the values of tidal datums calculated were compared with the predefined values in the Admiralty tidal publication, revealing a difference of (+ 0.20 m) between the two years 1906 and 2014.