Times and heights of high and low tides for the coast's harbours, 10 to 27 October 2026 (Paris time), with the day's tide coefficient. The calculator gives the water height at a precise moment: enough to check a harbour photo, where the water rises and falls by several metres in a few hours.

In real life: the SHOM (maree.shom.fr, France's hydrographic service), maree.info, harbour-master tide tables. The tide shifts by about 50 minutes a day: the water height at a given time therefore changes a lot from one day to the next, which makes it possible to date a photo taken in a harbour.