公开(公告)号：US5264682A

公开(公告)日：1993-11-23

申请号：US654727

申请日：1991-02-12

申请人： Donald G. Copland

发明人： Donald G. Copland

IPC分类号： G06C1/00

CPC分类号： G06C1/00

摘要： A method and apparatus for plotting a boat's position relative to a rhumb line when tacking. The apparatus includes three independently rotatable disk members. A first disk member presents a compass rose, the second of the disk members presents an indicator that aligns on the compass rose along with a grid, and the third of the disk members presents a rhumb line. The starting and ending positions are plotted on the rhumb line. The rhumb line is then aligned with the compass rose in accordance with the boat's true course. An initial course is set by rotating the indicator with respect to the compass rose on the first disk. The boat's first tack position is located and plotted on the grid by counting grid lines from the starting position. The second disk is then rotated and the next tack position is plotted away from the first tack position. The tack positions are plotted on the third disk to provide the boat's position relative to the rhumb line.

摘要翻译： 一种方法和装置，用于在紧固时绘制船的位置相对于竖线。 该装置包括三个可独立旋转的盘构件。 第一个磁盘成员呈现罗盘，第二个磁盘成员呈现一个指示符，它与罗盘一起与网格对齐，而第三个磁盘成员呈现一个垂直线。 起始位置和结束位置绘制在垂直线上。 然后按照船的真实路线，将罗拔线与罗盘玫瑰对准。 通过相对于第一盘上的罗盘玫瑰旋转指示器来设定初始过程。 通过从起始位置计数网格线，将船的第一个位置定位并绘制在网格上。 然后旋转第二个盘，并将第二个钉头位置从第一钉扎位置绘制。 把钉位置绘制在第三个盘上，以提供相对于竖线的船的位置。