Research of Equidistance Cylindrical Projection Applied in Polar Nautical Chart

Aims at the problem that the current polar projections are not completely suitable for polar nautical chart plotting and using, and combines with the existing chart plotting and using methods, the paper proposes the idea of choosing Equidistance Cylindrical Projection as the projection of Polar Chart, analyzes the projection applicability and the shortage of its application aspects. For rhumb line plotted and azimuth, distance measurement are the basic function in chart using, therefore, the paper particularly studies these problems and puts forward corresponding solutions. Meanwhile, some example calculations have been done to validate the corresponding solutions, which lays foundations for the projection application in polar chart.