Can anyone help ? I need to know times of HW Portsmouth for Sunday 30th Sept. Naturally my almanac is on the boat and I am a work and all the online tide predictors only go as far as 5 days from today. Doh !
To be expected... WxTide harmonic series are a bit too short to provide truly accurate values for complex tides. Results given by SHOM 21 terms series used in pocket calculators are not so different for that location.