I've just realized that Windy offers now a Tidal currents layer.
That's great ! And all around the world. Very impressive!
I'll check how accurate is this data, but looks already consistent.
Just a remark that has been already posted (and will be again by mariners and sailors): the directions of currents are not shown in a conventional way:
EDIT: the currents are now shown in the correct way. Thanks.
Copernicus tidal currents data is based on the variation of sea surface altimetry measured by satellites (From CMEMS Copernicus Marine Environment Monitoring Service).
From this data which gives the sea surface level, tidal currents are computed.
The satellite data resolution is 0.25° x 0.25° or 15NM x 15NM (27km x 27km). That is enough to estimate correctly the sea surface level excepted in closed, long or narrow bays. In fact the tidal currents speed depends also on coast line and seabed mapping. So in some areas these currents are probably underestimated.