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潮カレンダーは David Flater's プログラムが基になっています。Xtide潮予測の保証はありません。Xtide needs so called "harmonics constants" for a location in order to calculate tide calendars. If you would like us to add tide calendars for your country you may contact the national hydrographic institute and ask them to provide the harmonic constants for their national tide spots.