176 
Process: 
3. Management of data and reference parame 
ters 
Name 
Date 
Created: 
Mathes 
28.5.98 
Data flow: 
Ship data 
Checked: 
1. Origin 
• The origin of the ship data used must be known. 
• Ship data must originate from an authorised source (e.g. shipyard documents). 
2. Validity 
• The validity of the ship data used must be confirmed by the particular source. 
3. Quality 
• Ship data must be sufficiently accurate in accordance with their particular use. This applies par 
ticularly to the accuracy of ship geometry and sensor locations (see also Harmonisation). 
• The topicality of ship data must be ensured. Corresponding mechanisms for updating data, eg 
after changes in the sensor technology, must be available. 
• Ship data must not be mutually contradictory. This should be borne in mind particularly if ship 
data are not kept in a central data bank. Multiple storage of data of the same type 
should be avoided. 
4. Harmonisation 
• When storing ship data, care should be taken to ensure a consistent unit system; appropriate test 
procedures should be provided. 
• Space-related data (e.g. sensor locations) should be represented in a uniform coordinate system. 
If the origin of this system is not identical to the reference point of the ship, the reference between 
the two must be known. 
• The accuracy of ship data should be harmonised in line with the accuracy of the sensor technol 
ogy. Space-related ship data (dimensions, sensor locations) must possess at least 
the same accuracy as the best position determination methods available at any given time. 
5. Criticality 
• Mechanisms should be provided in order to protect ship data from unintentional change. 
• It must be ensured that ship data can be modified only by authorised persons. 
6. Limit values and alarm facilities 
• Attempt at unauthorised modification of ship data. 
• Mutual inconsistencies of the ship data. 
7. Representation/display 
• A central display of the stored ship data should be provided. The following data should be 
contained for each datum: exact designation, origin, date of last change.