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Seamanship Question #32
Good point Jeff.
"Jeff" wrote While the Rule of 12ths is a very handy tool for estimating the tide height at any point in the cycle, I would be very careful of using to extrapolate total range from one hour's observation. For instance, if your observation were off by one inch, then you might mis-estimate the full range by a foot. On a related topic, sometimes people will claim that the Rule of 12ths also applies to current estimation. This is generally not true. The strength of the current through the cycle is highly dependent on the local geography. In particular, the strong currents that are generated by tidal differences on connected bodies of water (Hell Gate, Cape Cod Canal, etc.) ramp up very quickly and their chart is more of a square wave, than a sine. |
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