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Radar Chart-matching Devices
Published online by Cambridge University Press: 18 January 2010
Extract
The usual method of using radar for navigation at sea is to transfer the information from the PPI to the chart. In many instances, however, the pilot will con the ship directly from the PPI, using his local knowledge, which is equivalent to using a chart impressed on his mind. In such cases it is necessary to identify immediately and unambiguously the PPI paints, which often bear little resemblance to the shape on the chart of the feature which is producing the echo.
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- Copyright © The Royal Institute of Navigation 1952
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