| 摘要 |
PURPOSE:To except slipping position lines to measure accurately the position of a ship itself by displaying position lines on a basis of measured data and displaying a marker in an optimum position to display the position of the ship. CONSTITUTION:Position information which are measured by navigation devices 1 and 2 or the like and are written in a RAM6 are read out through a microcomputer 5 and are converted to required coordinate information, and position lines L1', L2', L3', etc. having widths corresponding to errors are displayed on a display device 9 by a display control part 10 or the like. When this display is observed and a keyboard 7 is operated to place a marker 12 in the optimum position at intersections among lines L1', L2', and L3', the position of the ship is displayed on a display device 13. In this case, slipping position lines or the like due to slip of measured values are excepted by observation of lines L1', L2', and L3', and the position of the ship is measured accurately. |
