7.3 
Management of data and reference parameters 
7.3.1 State identification 
Functionality level 1 
Functionality level 2 
Function 
Input information 
Output information 
1. Identification of state 
variables to be measured 
1.1 Determine own ship 
position 
1.1.1 Provide data and 
criteria 
• See Table 4 
• Different LATxy, LON*y 
1.1.2 Compare data and 
criteria 
• Result information from 1.1.1 
• Position of meas. points on ship 
. HDG 
• Accuracy of all input variables 
• Plausibility criteria 
• Statement concerning the consistency and plausi 
bility of the measured values 
• Inconsistency between position values? 
• Inconsistency between HDG and position values? 
1.1.3 Assess result of 
comparison 
• Result information from 1.1.2 
• Consistency criteria 
• Is a position value usable? 
1.1.4 Selection of data to 
be provided 
• Result information from 1.1.1 
• Result information from 1.1.3 
. LATxy, LONxy 
1.1.5 Provision of data 
• Result information from 1.1.4 
• Representation of LATxy, LONxy for navigator 
• Display if positions inconsistent 
• Provision of LATxy, LONxy for further processing 
1.2 Determine heading 
1.2.1 Provide data and 
criteria 
• See Table 4 
• Different HDG 
1.2.2 Compare data and 
criteria 
• Result information from 1.2.1 
• Accuracy of all input variables 
• Plausibility criteria 
• Statement concerning the consistency and plausi 
bility of the measured values 
1.2.3 Assess result of 
comparison 
• Result information from 1.2.2 
• Consistency criteria 
• Is a measured value usable? 
1.2.4 Selection of data to 
be provided 
• Result information from 1.2.1 
• Result information from 1.2.3 
. HDG