| 摘要 |
PROBLEM TO BE SOLVED: To provide a device capable of switching a communication channel at the best spot. SOLUTION: In order to switch the communication channel at the best point, the quality of radio waves such as an electric field level on a traveling road and the error rate of radio data transmission, etc., is checked beforehand and the switching spot of the communication channel is decided by the result. A radio equipment 1 is provided with map information 7, a function for storing required road map information from the map information 7 to a position information storage part, writing the traveling road on the map and writing the communication switching spot on the road, a means for calculating its own position by a GPS receiver 4 and a position calculation device 3 and the means for detecting that the written communication channel switching spot is reached. |
