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Page Title: Planning and Constructing Great-Circle Tracks, Continued
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Planning and Constructing Great-Circle Tracks - 14220_376
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Planning and Constructing Great-Circle Tracks, Continued - 14220_378
Planning and Constructing Great-Circle Tracks, Continued Track Construction Use  the  following  step  action  table  to  construct  a  great-circle  track: Step Action 1. Plot  the  departure  and  arrival  points  on  the  gnomonic  chart projection. 2. Draw  a  line  between  the  two  points  (see  fig.  12-1). 3. Inspect  the  track  to  make  sure  that  is  does  not  cross  any dangers.   Redraw   if   necessary. 4. 5. 6. 7. Note:    If  the  track  must  be  redrawn,  always  do  so  on  the gnomonic  chart.  This  will  have  less  impact  on  overall  mileage than  navigating  around  dangers  on  a  Mercator  chart. Select  convenient  points  to  use  to  transfer  the  track  to  small scale  Mercator  charts.  Normally  these  points  should  be  about 300  nmi  apart;  refer  again  to  figure  12-1. Label  the  points  beginning  with  the  letter  A. Extract  and  record  the  latitude  and  longitude  of  each  point. This  information  can  be  used  later  for  the  movement  report (MOVREP). Transfer  the  points  to  small  scale  Mercator  charts  (fig.  12-2)  to show  the  entire  transit. Transfer  the  points  to  larger  scale  Mercator  charts  that  cover about  one  leg  of  the  transit  each. 8. 9. Example:  Transfer  points  A  and  B  on  the  first  Mercator  chart selected;  transfer  points  B  and  C  on  the  second  Mercator  chart selected;  and  so  on. Label  the  track  with  course  and  distance  for  that  leg. Go  to  steps  7  and  8  until  all  legs  of  the  track  have  been transferred  and  labeled. Now  the  last  stage  is  to  lay  out  PIM.  Move  on  to  page  5. 12-3

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