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date: 01 March 2021

radar, 

Source:
The Oxford Companion to Ships and the Sea
Author(s):
Mike RicheyMike Richey

an acronym for Radio Detection and Ranging, a system for determining the range and bearing of an object by transmitting bursts of electromagnetic energy and timing the intervals between the transmission and return of the echoes. The main purposes of radar at sea are for collision avoidance and ... ...

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