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Satellite Navigation Systems - 14220_247
LORAN-C Introduction Loran-C  (LOng  RAnge  Navigation)  is  an  electronic  aid  to  navigation consisting  of  shore-based  radio  transmitters.  The  Loran  system  enables users  to  determine  their  position  quickly  and  accurately  day  or  night  in any  weather.  Your  position  is  determined  by  locating  the  crossing  point of  two  lines  of  position  on  a  Loran-C  chart.  Most  units  today  will  give you  a  direct  readout  in  latitude  and  longitude,  which  will  allow  you  to plot  your  position  even  if  you  do  not  have  a  Loran  overprinted  chart. Loran-C  is  generally  accurate  to  1/4  nautical  mile.  The  Loran-C  system allows  you  to  determine  your  position  by  means  of  radio  signals broadcast  by  stations  of  known  position.  A  fix  is  determined  by  Loran through  the  intersection  of  lines  of  position  obtained  by  reference  to shore  stations  whose  locations  are  known. Time  Difference In  Loran-C,  you  locate  a  LOP  by  determining  the  difference  in  time  of Lines arrival  of  signals  sent  out  by  each  of  a  pair  of  broadcast  stations.  This interval  is  constant  when  the  ship  is  located  anywhere  along  a  previously determined  Loran-C  LOP.  To  say  it  another  way:  When  the  time interval  is  a  specific  amount,  the  ship  must  be  somewhere  on  a predetermined  Loran-C  LOP  that  is  a  focus  of  all  points  where  the interval  between  arrival  of  signals  is  the  same. Plotting Time Most  of  the  Loran-C  receivers  in  use  today  provide  the  user  with  two Difference  Lines   displays  of  fix  information.  The  most  commonly  used  is  a  readout  of the  latitude  and  longitude  of  the  vessel’s  position.  The  other  is  a readout  of  the  time  delay  of  each  LOP,  which  can  then  be  plotted  on  a Loran-C  overprinted  chart.  The  steps  for  plotting  the  time  difference LOPS  are  described  briefly  below: Step Action 1. Examine  the  Loran-C  chart  for  your  area.  LOP  lines  are marked  with  time  difference  numbers;  chain  and  secondary identification  also  appear  every  few  lines. 2. Read  the  time  difference  in  the  TDA  display. 3. On  the  chart,  locate  the  line  that  most  closely  fits  that  reading for  the  secondary  selected. 4. Examine  adjacent  lines  and  interpolate  to  determine  where  the line  that  corresponds  to  your  reading  is  to  be  plotted 5. Repeat  steps  2  and  3  for  the  TDB  display 6. Locate  the  point  where  the  two  lines  cross  and  label  the  fix with  a  small  triangle  along  with  the  time  affixed  close  by. 8-42

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