12 
Monitoring and executing the voyage 
Determining set/actual deviations 
7.2.1 
Functionality level 1 
Functionality level 2 
Function 
Input information 
Output information 
1. Monitor observance of set 
track 
1.1 Monitoring the trans 
verse deviation 
1.1.1 Record set and ac 
tual values 
• Planned track (way point list) 
• Actual position 
• Necessary input data for monitoring the set track 
are available 
1.1.2 Compare data 
• Output information from 1.1.1 
• Deviation of actual position from ref. track 
• Graphic representation of set track and track 
limits 
• Representation of actual position of ship 
1.1.3 Assess comparison 
• Output information from 1.1.2 
• Track limits 
• Statement whether actual position is within the 
track limits 
1.1.4 Provide result 
• Deviation of actual position from 
the set track, track limits 
• Output of current deviation from the set track for 
the user, display whether deviation is within the 
given limits 
• Alarm if actual position is outside the Track 
confinement” (set track and limits) 
1.2 Monitoring the time 
profile 
1.2.1 Record set and ac 
tual values 
• Present position 
• Position for which passage/ 
arrival time is stipulated (“set po 
sition”) 
• Present time 
• Fixed passage or arrival time 
• Necessary input data for monitoring the time 
profile are available 
1.2.2 Compare data 
• Output information from 1.2.1 
• Distance between actual position and “set posi 
tion" 
• Time diff. between ref. passage/ arrival times 
and present time for the position considered 
1.2.3 Assess comparison 
• Output information from 1.2.2 
• Limits for time diff./distance 
• Statement whether determined time difference 
or distance is within given limits 
1.2.4 Provide result 
• Output information from 1.2.2 
• Output information from 1.2.3 
• Statement whether schedule is being observed