Quantcast Chart Accuracy - 14221_33

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Chart Accuracy Information Chart  accuracy  is  hard  to  determine  exactly.  Several  things  need  to  be taken  into  consideration. The  first  and  most  important  factor  to  consider is  that  a  chart  can  be  only  as  accurate  as  the  survey  on  which  it  is  based. To  judge  the  accuracy  and  completeness  of  the  survey,  take  note  of  its source  and  date.  Usually,  early  survey  dates  indicate  that  the  chart  may have  several  irregularities. A  chart  must  be  tested  before  it  may  be  used with  a  high  degree  of  confidence. In  heavily  trafficked  waters,  a  chart  is normally  quite  accurate  due  to  more  thorough  survey. Tip:  Another  clue  with  which  to  determine  accuracy  is  the  abundance or  absence  of  soundings. Infrequent  soundings  are  an  excellent  indicator that  the  survey  was  not  of  great  detail. Chart Production Compromise  is  sometimes  necessary  in  chart  production,  as  scale, clutter,  and  other  factors  may  preclude  the  presentation  of  all information  collected  for  a  given  area.  The  National  Ocean  Service publishes  about  1,000  charts  covering  in  excess  of  86,000  miles  of shorelines.  DMAHTC  publishes  an  even  greater  amount. Caution Charts  are  an  aid  to  navigation  and  must  be  used  with  a  certain  amount of  caution  as  they  are  not  a  complete  guarantee  of  safety.  Every  QM team  is  responsible  to  report  any  changes  or  errors  they  may  encounter on  the  charts  they  use. In  the  back  of  each  Notice  to  Mariners  is  a  form that  may  be  filled  out  listing  any  discrepancies  on  charts.  A  radio message  may  also  be  sent  to  DMAHTC  Attn:  NTM. 1-17

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