. . . "The process for generation of a map display according to claim 1, wherein the circle arc is described with at least three parameters, such as for example coordinates of the center point (A, B, C, D), radius (ra, rc, rd, re,), start and end point of the circle arc, arc curve length (a, c, d, e), initial direction, magnitude of direction change (??, X, ??, ??). 3." .