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The radar operator has a role of interpreting the radar displays to provide his best aid in maneuvering the ship.   
For this purpose, the  operator has  to observe  the radar displays  after  fully  understanding  the advantages  and 
disadvantages  that  the  radar  has.    For  better  interpretation  of  radar  display,  it  is  important  to  gain  more 
experiences by operating the radar equipment in fair weathers and comparing the target ships watched with the 
naked eyes and their echoes on the radar display. 
The radar is mainly used to monitor the courses of own ship and other ships in open seas, to check buoys and 
other nautical marks when entering a port, to measure own ship’s position in the coastal waters relative to the 
bearings and ranges of the shore or islands using a chart, and to monitor the position and movement of a heavy 
rain if it appears on the radar display. 
Various types of radar display will be explained below.