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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 pa 
rameters/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”