| 摘要 |
A compact portable microfiche chart display system especially adapted for use in marine navigation and piloting. A projection screen on which a chart is displayed has provided thereon a compass rose and one or more rotatable course indicators to enable plotting to be made directly in association with the displayed chart. The system can be oriented with the projected chart in a horizontal plane such that the course indicator can be employed to take pelorus sightings in direct relation to charted position.
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