| 摘要 |
PROBLEM TO BE SOLVED: To easily look for persons nonreturn to gathering time by confirming positions and the time of respective persons when a large number of persons such as participants of a bus tour and students of an excursion disperse over a comparatively wide area. SOLUTION: A position confirming device is composed of a single master machine 1 and plural slave machines 21 , 22 ..., the master machine 1 and the respective slave machines 21 , 22 ... predetermine ones' own positions and the time on the basis of GPS navigation, the respective slave machines 21 , 22 ... transmit the determined slave machine positions and the time to the master machine 1 by a successive inquiry from the master machine 1, and the master machine 1 display transmitted positions and the time of the respective slave machines 21 , 22 ... on a map together with the determined master machine 1 position and the time. |
