| 摘要 |
A system is provided for producing on-board timing for a vehicle traversing a course such as a car raceing circuit or a speedboat course defined by marker buoys. The vehicle is equipped with a magnetic sensing coil (22) for producing electrical signals in response to detection of magnets disposed at one or more positions along the course. In the case of buoy markers, the magnets (26) may be mounted on certain of the buoys (10, 13, 14, 17). The output from the sensing coil (22) is used to control on-board timing circuitry to enable the average vehicle speed over the course to be determined and displayed.
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