127

4.2.4  Management  of  data  and  reference  parameters
The  data  memories  shown  on  DFD  3  model  the  reference  systems  and  data  bases  needed  within  an
Integrated  Navigation  System:
Vessel-related  parameters  like  ships  dimensions  or  manoeuvring  characteristics.
Geographical  data,  e.  g.  the  data  base  for  nautical  charts.
Navigational  reference  parameters:  geodetical  reference  systems,  sensor  locations,  reference  systems
for  sensor  data.
A  distinction  will  be  made  between  data  and  parameters  used  for  future  planning  ("Preplanned  parameters/data") ­
  and  current  parameters.  Preplanned  information  will  be  used  for  instance  within  the  task
area  voyage  planning  to  get  a  specific  area  for  planning  for  future  operational  states  of  the  vessel.
Current  information  will  be  provided  continuously  based  on  available  state  variables  and  related  to  the
actual  position  and  the  actual  movement  of  the  vessel.
It  is  not  necessary  for  these  data  and  parameters  to  be  administered  centrally;  they  can  also  be  kept
locally.  If  this  is  the  case,  however,  particular  attention  should  be  paid  to  questions  of  consistency  and
access  rights.

Preplanned  Current  Preplanned  Current  Preplanned  Current
vessel  parameters  vessel  parameters  geographical  data  geographical  data  reference  parameters  reference  parameters

DFD  3:  Task  “Management  of  data  and  reference  parameters”