Automatic selective displaying method of charts

Abstract

Abstract PURPOSE: To surely grasp navigation situations of the surroundings of the own ship at a glance by selecting the chart most suited to the current own ship position, displaying the chart information thereof on a CRT and further simultaneously displaying radar video, symbols of other ships, etc. CONSTITUTION: In case the own ship position is in the A point, a processing unit 3 selects the index information corresponding to the chart S 3 of the smallest area out of charts S 1 thru S 3 and further reads the chart information of the chart S 3 out from a memory device 1. Hence, said chart information is sent to a CRT control unit 5. The CRT control unit 5 suitably selects said chart information and sends the same to a CRT 4. As a result, the chart within the region IA is displayed on the display screen of the CRT 4. On the other hand, radar video, symbols of other ships, etc. are superposedly displayed by the radar information from a radar unit 6, the information necessary for the navigation of the own ship is simultaneously displayed. Thereafter, the chart information at the own ship positions B point, C point and D point is displayed in the similar manner. COPYRIGHT: (C)1979,JPO&Japio

Inventors

• 👤 Takeshi Kodama

Bibliographic Details