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Determining the Ship’s Position by Running Fix - 14221_243
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Using the Fathometer - 14221_245
Electronic Navigation Introduction Position  is  determined  in  electronic  navigation  in  about  the  same  way that  it  is  in  piloting,  but  there  is  this  important  difference:  the  objects used  to  fix  the  ship’s  position  need  not  be  visible  from  the  ship. Instead,  their  bearings  (and  sometimes  their  ranges)  are  obtained electronically. There  are  many  different  types  of  electronic  equipment  used  in navigation;  some  of  these  you  may  have  used,  others  you  may  have  only heard  about.  Some  of  the  more  important  ones  are: Fathometer Radar Loran-C RDF Omega SATNAV SINS GPS Many  people  believe  that  electronic  navigation  is  becoming  a  primary method  for  both  piloting  and  long-range  navigation.  However,  you  must continually  bear  in  mind  that  there  is  no  one  system  that  can  always  be used.  Every  method  has  its  own  limitations,  and  you  should  appreciate and  understand  them.  Electronic  methods  are  vulnerable  because  of  the possibility  of  breakdown,  malfunctioning,  or  damage.  They  are  also subject  to  atmospheric  conditions  and  some  can  be  successfully  blocked by  jamming,  capture,  or  destruction  of  related  shore  equipment  by  an opposing  force.  You  must,  therefore,  have  a  working  knowledge  of  all navigational  methods  available  to  you  and  be  able  to  use  them  all  as required.  Furthermore,  the  old  saying  "the  equipment  is  only  as  accurate as  its  operators"  holds  true.  And  operators  are  only  as  accurate  as  their complete  knowledge  of  the  equipment  they  are  using. Section Objectives Describe  the  procedure  used  to  annotate  the  fathometer  echogram. List  the  components  of  the  fathometer. List  at  least  five  types  of  electronic  equipment  used  in  navigation. List  the  five  steps  used  to  plot  time  difference  lines  used occasionally  with  electronic  navigation. List  the  components  and  operation  of  satellite  navigation  systems. 8-40

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