| 摘要 |
PROBLEM TO BE SOLVED: To increase the life of electric power of a battery 36 for a portable station 12 equipped with a GPS receiving device 51. SOLUTION: Electric power of the battery 36 is supplied to a GPS receiving device 51 through a power switch 39 of the portable transceiver 21, a power supply circuit 40 and a switch 41. After a user turns the power switch 39 on, since then electric power is supplied to a portable transceiver 21 so as to hold actuation until returns it off, whereas power supply to the GPS receiving device 51 is intermittent due to on/off switching of the switch 41 by a CPU42. The GPS receiving device 51 implements positioning of current positions with dispatched power only during the "on" period of the switch 41. COPYRIGHT: (C)2007,JPO&INPIT
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