| 摘要 |
PROBLEM TO BE SOLVED: To easily grasp the depth unrecognizable only from an isobath of the position of a fishing ground field by indicating an own ship position by a position mark on a map on a display screen and indicating the depth of that position with the position mark. SOLUTION: An operation unit 2 and a GPS3 are connected to an input terminal of a CPU1, while a transmitter 4 is connected to an output terminal of the CPU1. An ultrasonic vibrator 5 connected to the output terminal of the transmitter 4 is connected to an input terminal of a receiver 6, and an output terminal of the receiver 6 is connected to an input terminal of the CPU1. To the CPU1, a read-only memory 7, a read/write-only memory 8, a backup memory 9, and a display control unit 10 are connected. In addition, a display device 11 and a VRAM12 are connected to the display control unit 10.
|
