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Navigational Radar - 14221_251
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How to Obtain a RADAR Bearing and Range - 14221_253
Navigational Radar, Continued Figure  8-31.  PPI  presentation. PPI Display Interpretation The  scope  can  be  adjusted  to  several  different  range  scales  to  provide greater  target  detail.  Range  is  measured  in  yards  or  nautical  miles  from the  center  of  the  scope  to  the  target  indicated. Some  factors  affecting  the  accuracy  of  radar  are  beam  width,  pulse length,  mechanical  adjustment,  and  interpretation.  Because  of  beam width  distortion,  radar  bearings  are  usually  less  accurate  than  radar ranges.  A  fix  obtained  where  two  or  more  lines  of  position  are determined  by  ranges  is  more  accurate  than  one  obtained  by  bearings alone.  In  most  cases,  radar  ranges  will  always  be  available  and  will  be used  over  radar  bearings. Shorelines  appear  as  they  do  on  the  chart;  however,  the  PPI  displays  a scaled  down  version  of  an  area  of  the  chart.  Determining  exactly  what you  are  seeing  and  where  that  area  is  on  the  chart  takes  practice. 8-48

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