There are many inland seas where have international and domesticsailing routes in the world. They have complicated lay of lands andtidal current. We propose Support System for Planning of NavigationSchedule (SUSPANSE), that utilizes current in these inland seas.SUSPANSE bears the least fuel consumption of ships. The least fuelconsumption realizes the preservation of natural environment in theseinland seas. In this paper, the objective sea area is the Inland Sea OfJapan (ISJ). The width of ISJ is 30 miles from North and South, and 240miles from East and West. ISJ has about 3,000 islands, which arescattered, and the current is complicated. Besides, main sailing routesof Japan exist in the ISJ. The estimation of current set and velocity inISJ is generally to carry out by using Tide Tables of Japan MaritimeSafety Agency (JMSA). 13 standard points and 212 semi-standard points oftidal current are prepared in ISJ. However, they are not useful forcalculation of tidal current velocity at optional points and time inISJ. For supplement these lack, JMSA publishes Stream Charts of each seaarea in ISJ. Tidal current database is prepared by utilizing the StreamCharts. The tidal current database is made from tidal currentinformation and geographical information, and they are piled up togetherin the database. Tidal current calculation system (TCCS) can estimatethe current velocity at optional point and time in ISJ. When sailingroute and departure time are input to SUSPANSE, ship's hours under wayis calculated in accordance with the sailing route. SUSPANSE recommendsthe optimal departure time in this day for shortest hours under Theeffective of SUSPANSE is confirmed by making comparison between actualhours under way and the output of SUSPANSE
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