| 摘要 |
A floating position marking device comprises a waterborne float 1, an underwater attachment means 3 and 4, and a heavier than water sinker 5. The device is arranged such that the float holds its position on the water surface 6 vertically above the sinker over a range of water depths when the sinker is resting on the bottom. The floating position marking device may be used in swimming pools and open waters. The floating position marking device may have options enabling it also to indicate the depth of water, water current speed and direction, and wind speed and direction. The floating position marking device may be made in various sizes. Smaller sizes may be light enough to be transported and deployed as required by tidal conditions, or at specific swimming or sailing events. |
