| 摘要 |
Herein described is a navigational system which includes apparatus for simultaneously displaying discrete navigational coordinate signals and recording these coordinate signals on a moving memory at predetermined time intervals as the vehicle navigates along a path. Thus, the path is permanently recorded for future use. During or at the end of the vehicle's outgoing voyage, the memory is applied to a display device which may include a transparent map overlay. The discrete coordinate signals are then displayed on the display, displaying the navigational discrete coordinates on the display, so that the operator may steer the vessel over an exact return path. Alternatively, the memory may be used with an appropriate autopilot so that the vessel returns to any point or completely traverses in reverse the initial outgoing course.
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