| 摘要 |
PROBLEM TO BE SOLVED: To provide a target for a marine shooting practice that improves visibility from long distance with a simple structure, is capable of transport easily, can be easily recovered after the practice, does not cause environmental contamination, and can reduce facilities costs. SOLUTION: A return reflection sheet 1 is applied to the outer surface of a balloon 1 made of a flexible film that is formed in a spherical shape when the inside is filled with air, and the balloon 1 is connected to a buoy 4 for floating above the sea surface.
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