During spring tides you should add a quarter of a knot for the speed of the spring current to your usual tide estimations and for neap tides a quarter of a knot has to be subtracted from the usual tidal current velocity.
Ngexesha lokutsibela kolwandle oluzeleyo kufuneka wongeze isahlulo sesine kwisantya senqanawa ukwenzela ukuba isantya esitsiba ngaso sisetyenziselwe kuqikelelo oluqhelekileyo lokuzala kolwandle nokwenzela ukuba ukuzala okuncinane kolwandle okwahlulwe kane kweqhina kuncitshiswe kukuzala kolwandle okuqhelekileyo nokusetyenziswa kwesantya