METHOD TO DETECT MOST ECONOMIC OPTIMAL VESSEL COURSE Russian patent published in 2015 - IPC G01C21/00 B63B51/00 

FIELD: measurement equipment.

SUBSTANCE: finding of the economic vessel course on the basis of hydrometeorological environment determined by parameters from external sources. Calculation of the course is based on average statistics data about hydrometeorological environment on a climatic course of the vessel, which is further its "axis", the calculation basis may be the arc of the larger circle. From external sources they receive three- or five-day forecast of sea disturbance. They calculate values of wind and wave losses of vessel speed for various courses during the first, second, third days of sailing; by means of the PC they search for versions of its motion. Ends of daily navigation are connected by a curved line - isochrone, the vessel course is arranged to reach the isochrone point closest to the destination point. After a new forecast calculations are repeated. Additionally they detect wind and wave losses of vessel speed according to the value χ, equal to the ratio of summary length of vessel trajectory, passing via areas with unfavourable conditions, to the total length of the trajectory L. On the basis of the vessel route, using a simulation model of storms and weather windows with the help of standard navigation means they also calculate cycles of storms and functions of distribution of their quantity and continuous duration.

EFFECT: increased validity of determination of optimal vessel track on the route depending on hydrometeorological conditions.

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