For approximate times that technique is ok but gets worse the further separated the reference station and the point of interest are. The error is also a strong function of local sea floor topology. However if you are interested in tide height rather than just times of slack water then this technique can degrade rapidly over fairly short distances.

True laziness is hard work

In reply to Re^5: Ocean tides in Perl by GrandFather
in thread Ocean tides in Perl by Anonymous Monk

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