| 摘要 |
PURPOSE:To display longitude and parallels together with tracks automatically on a display surface by controlling a cathode-ray tube via storage means in accordance with the signal information correspondence to the position signal, longitude and parallels based on the position measurement of a moving object. CONSTITUTION:In accordance with the information from a navigation apparatus 11 including a loran receiver and the like, a ship position signal generator 10 and a marker signal generator 12 generate respectively the ship position signals and the signals corresponding to longitude and parallels. These generators 10, 12 and a display storage unit 8, etc. are controlled by a write control circuit 13, and the electric signals corresponding to tracks, longitude and parallels are written in prescribed addresses and stored in the unit 8. The storage contents are read out via a read control circuit 9 and the display of a cathode-ray tube 7 is controlled, whereby the longitude and parallels are displayed automatically together with tracks. In accordance with the controlling of the write and read speeds of the circuits 13, 9, these can be displayed by desired scales. |
