| 摘要 |
PURPOSE:To make an operator's decision easy, and also to simplify the operation, by providing a mark video signal generating circuit, a signal switch and a timing signal generating circuit, superposing an audible bearing range of a selected directional beam on a picture, and displaying it. CONSTITUTION:To a conventional sonar device, a mark video signal generating circuit 7, a signal switch 6 and a timing signal generating circuit 8 are added. In this state, by a timing signal 14 of the timing signal generating circuit 8, a timing for switching a mark video signal 13 by which the signal switch 6 displays a boundary of a conventional signal 10 and a directional beam on an indicator is controlled. Also, the mark video signal generating circuit 7 inputs a cursor bearing signal 11 and a magnetic bearing signal 12 from a conventional sonar device 5 so as to generate the mark video signal 13. |
