| 摘要 |
<p>A wind and course calculator for navigation is provided comprising two superimposed disks made from a transparent material, a mobile disk 1 movable in rotation and in translation carrying a network of concentric circles corresponding to the speeds and of converging straight lines corresponding to the angular values of headings and a supporting disk 2 having a mark 5 indicating the heading and, at its periphery, graduations corresponding to the angular values of sailing trims of the boat and a scale of speeds 7 carried on the radius directed towards the indication of the heading, on the reverse side of which supporting disk is fixed a pointer 10, 11 having a slider 12 carrying a reference dot 13 serving as display and reading point. The upper face of the supporting disk has two parallel guides 3 between which the mobile disk 1 slides. This calculator is more particularly provided for use by competitors in sailing regatas for readily determining the surface wind, the heading to take, the basic course and the future surface wind related to the evolution of the current.</p> |
