@Menishoe
In some areas with bays, river mouths, estuaries or straits, the tidal current maps and tide graph are WRONG because the data resolution cannot take into account the shape of the coastline and seabed.
In connection with your post on the Gulf of Morbihan, between Le Crouesty and Vannes, there is about a 2 hour time difference for high tide, but in Windy, we see no difference.
Same problem with tidal currents.
I have already asked for this warning to be at least displayed in the "About this data" tab, but without result for the moment.