Day Skipper tides, step by step

Free guides to the five tidal calculations on the Day Skipper theory course. Each one explains the method, works through a full example and lists the mistakes students make most often.

1. Rule of twelfthsHeight of tide between high and low water, using the 1, 2, 3, 3, 2, 1 rule.
2. Tidal hoursBuild the HW−6 to HW+6 table, and pick the right hour for the stream.
3. Tidal curvesRead the standard-port curves between springs and neaps, and turn the factor into a height.
4. Secondary portsTime and height differences, interpolated, one stage at a time.
5. Course to steerRead the tidal diamond, then draw the vector triangle on a practice chart.

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