Tidal stream is the horizontal movement of water as the tide rises and falls.
Finding the Directions and Rate of the Tide:
– Tidal Stream Atlas
– Tidal Diamond from Chart
The first step is to find the high water time for the standard port (e.g. Portsmouth) on the day in question.
The direction and speed of the tidal stream varies with height of tide, and can be found for each hour before or after high water at the Standard Port. A spring tide has a speed about double that of a neap tide.
If in between springs and neaps, for maximum accuracy you have to interpolate between the spring rate and the neap rate.
Reeds Almanac: Page 62 (Year 2020):
Computation of rates table to find out the exact range.
