| 摘要 |
PURPOSE:To prevent a buoy from floating away due to a tidal current or the like, by coupling one end of a rope to an anchor, coupling the other end of the rope to the buoy through a winch-like winder, and winding the rope after the anchor has reached the bottom of water. CONSTITUTION:One end of a rope 2 coupled at the other end to an anchor 3 is coupled to a buoy 10 through a winch-like winder 6, which is driven by a motor 5. At an aimed spot, the buoy 10 is moved down to the surface of water, and the anchor 3 and the rope 2 are sunk toward the bottom 8 of the water. After it is confirmed that the anchor 3 has reached the bottom 8 of the water, an instruction signal is sent by a radio means or the like so as to wind the rope 2. The rope 2 is kept unslacked enough to prevent the buoy 10 from floating away due to a tidal current or the like. This results in indicating the aimed spot accurately.
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