Ship Collision Computer Plotting

Typhoon,a kind of strong warm cyclonic storms occurring over tropical oceans,is one of the most seriously disastrous weather systems.Therefore,it is of great immidiate significance to study and keep informed on the law of its occurrence .development and movement.to map out scientific and proper plans as soon as possible to avoid it,and to take correct and effective measures resolutely so as to ensure safe navigation of ships and the safety of crew,passengers,cargo and ships.Seeing that typhoon has brought great harm to mankind,meterological departments of all countries have attached great importance to the forecast and precaution of tropical cyclones.The prompt development and the wide application of the technology of the satellite remote sensing,radar detection,numerical weather forecast.numerical statistics weather forecast and computer simulation forecast in the field of meterological supervision and forecast has enabled people to improve their forecast level greatly.Although the accuracy in meterological forecast of tropical cyclones has been distinctly improved, it is still a difficult problem confronting masters and anti-typhoon team leaders of the companies how to steer clear of typhoon reasonably and safely in case that the actual resistance to typhoon is strong enough, the sea area wide enough, and the time permitting ; to avoid unreasonable deviation,anchoring for shelter, blindly rushing onto her path,being involved in storm area,even into the the center of typhoon; under the limitation of the condition of the sea area and time.how to take correct meassures to escape , such as navigating with wind or windward in bias angle, slowing down, anchoring, berthing alongside the warf, mooring to buoy,etc. as early as possible.The traditional solution to the problem is to plot the forecast position of typhoon center and the ship's position on the <> ,to pay much attention to the relative position between the ship and typhoon,and the tendency of their movements,to consider the affects of all kinds of factors and leave enough room, to use the plotting method of geometric relative motion to figure out the course which the ship should take to keep away from typhoon on the small scale chart.What the article discusses is to design a computer plotting system to solve the problems how to promptly and precisely study out the above mentioned location and plotting problems.Considering the affects of all kinds of factors and leaving enough room, to scan the safety course in all directions, make forecast about the relative position of the ship and typhoon,the tendency of their movements, render a vital group of data and a direct diagram which the captain cares about, help the users to make the scientific and resonable decisions , to take correct and effective measures to keep away from and withstand typhoon early and resolutely, for all the practical problems in decision-making to keep away from typhoon .This article starts with the following aspects to study and solve the following practical problems,1 The foundation for vessels to keep away from and withstand typhoonThe article briefly introduces typhoon's weather characteristics,weather structure , number, naming, forming, development and its law of movement. It also discusses the ways and significance for merchant ships to collect in all-round way the information of typhoon and to make spot forecast,doubts the applicability of " barometric daily change correction table", and puts forward the author's view on the judging ways on the ship's location in gale circle.This chapter mainly discusses the process of decision-making and the application of technology, brings forward the concepts of the objective, the policy and the ship disaster plan and disaster supply kit. This chapter also approaches the juristical relationship between master and anti-typhoon team leaders, explains the concrete meassures and the keypoit on technological application, and points out the points to be discussed in sector means of typhoon avoidence.