Functionality level 1 
Functionality level 2 
Function 
Input information 
Output information 
2.2.3 Assess result of 
comparison 
• Result information from 2.2.2 
• Consistency criteria 
• Is a determined value usable? 
2.2.4 Selection of data to 
be provided 
• Result information from 2.2.1 
• Result information from 2.2.3 
• ROT 
2.2.5 Provision of data 
• Result information from 2.2.4 
• Representation of selected value for the navigator 
• Display if measured values inconsistent 
• Provision of selected value for further processing 
2.3 Determine speed 
over ground 
2.3.1 Provide data and 
criteria 
• See Table 3 
• Different SOG x 
2.3.2 Compare data and 
criteria 
• Result information from 2.3.1 
• Accuracy of all input variables 
• Consistency of all input variables 
• Plausibility criteria 
• Statement concerning the consistency and plausi 
bility of the measured values 
2.3.3 Assess result of 
comparison 
• Result information from 2.3.2 
• Consistency criteria 
• Isa determined value usable? 
2.3.4 Selection of data to 
be provided 
• Result information from 2.3.1 
• Result information from 2.3.3 
• SOGx 
2.3.5 Provision of data 
• Result information from 2.3.4 
• Representation of selected value for the navigator 
• Display if measured values inconsistent 
• Provision of selected value for further processing 
2.4 Determine speed 
through water 
2.4.1 Provide data and 
criteria 
• See Table 3 
• Different STW X 
2.4.2 Compare data and 
criteria 
• Result information from 2.4.1 
• Accuracy of all input variables 
• Consistency of all input variables 
• Plausibility criteria 
• Statement concerning the consistency and plausi 
bility of the measured values 
2.4.3 Assess result of 
comparison 
• Result information from 2.4.2 
• Consistency criteria 
• Is a determined value usable? 
2.4.4 Selection of data to 
be provided 
• Result information from 2.4.1 
• Result information from 2.4.3 
• STWx