| 摘要 |
PURPOSE: To expand a communication-enabling range, so that the position of a device located outside the direct communication-enabling range can also be displayed, in the case when positions of a plurality of devices are displayed. CONSTITUTION: Bidirectional communication with a plurality of devices can be executed through an antenna 2. Based on a signal from sent from an artificial satellite constituting GPS and received by an antenna 1, a positional information computing unit 4 obtains positional information on its own device and stores it in a memory 9. A group identification code is set in a signal processing/control part 8 and a signal containing the positional information and others of another device, which is received by the antenna 2, is written in the memory 9 when the group identification code contained there and detected by a group identification code detector 14 coincides with the group identification code set in the signal processing/control part 8. In this way, the positional information on individual devices is collected also in the memory 9 and their positions are displayed in a display unit 11, while the information in the memory 9 is transmitted to other devices from the antenna 2. |
