"Peter S/Y Anicula" wrote...
If you only know the time of HW and LW, you can assume that the
curve
of the tidal current will look a bit like a sinus curve.

Yes, that's true. The current will also follow the 'rule of 12s'
somewhat, lagging because of the momentum of the water in motion.

In the absence of current tables, assume the max current is at 7/12s the
interval between high & low water.

DSK