| 摘要 |
PROBLEM TO BE SOLVED: To call return to the front of a casing by raising a caution to a game player before performing an approach run. SOLUTION: This device is provided with a distance sensor (3) for measuring a distance between the casing and the game player, a comparing means (1) for comparing measurements by the distance sensor (3) with a prescribed value and announcing means (4 and 5) for an announcement to the game player. When it is detected by the distance sensor (3) that the distance between the casing and the game player exceeds a prescribed value, the comparing means (1) makes the announcing means (4 and 5) announce such a situation to the game player.
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