| 摘要 |
A device to aid motorists in determining their position on a highway map includes a freely supported globe having a map of the area being traveled. The globe is moved by a motor driven magnetic drive wheel which tracks a route path or film traced on the selected route with a marker containing a supply of para-magnetic particles in a fast drying liquid or a paste carrier which is applied to the selected route with a marker prior to initiation of the trip. A motor speed control knob with a pointer and associated scale with vehicle speed indicia is pre-set or periodically adjusted to move the globe at a speed related to the scale of the map and corresponding to the vehicle speed to maintain the vehicle position on the route path in registry with a position indicating pointer on a magnifying viewing window.
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