Your route passes this headland, where the stream runs hard. What do you call a place like this that decides the timing of your whole passage?
A chart: a headland sticks out from the coast into the sea. Tidal stream arrows bunch together round its tip, the heaviest marked 4 knots, running from right to left. A yacht approaches from the left, heading right, against the arrows.
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A tidal gate. A tidal gate is a place, often a headland or a narrow channel, that you can only sensibly pass at certain states of the tide. Work out when the gate is open, then plan the rest of the passage around being there at that time.
