7.4.3 
Evasion of bad weather regions 
Functionality level 1 
Functionality level 2 
Function 
Input information 
Output information 
1. Planning evasion 
route 
1.1 Collect information 
1.1.1 Record input 
data 
• Present set track 
• Present meteorological information 
• Hydrographic and geographical infor 
mation from the sea chart 
• Information necessary to assess the situation and to 
plan the evasion route 
1.1.2 Evaluate data 
• Result information from 1.1.1 
• Assessment whether necessity of evasion exists 
• Identification of “hazardous area” 
• Development of a trend prediction 
1.1.3 Provide infor 
mation 
• Result information from 1.1.2 
• Provision of necessary information for planning the 
evasion route 
1.2 Plan evasion route 
1.2.1 Record input 
data 
• Set track 
• Position of own ship 
• Identified position and extent of bad 
weather region 
• Expected development 
• Necessary input information for planning the evasion 
route 
1.2.2 Evaluate data 
• Result information from 1.2.1 
• Set values for course/speeds for the individual sections 
of the evasion route 
1.2.3 Provide infor 
mation 
• Result information from 1.2.2 
• Provision of the planned evasion route for further use in 
the system 
2. Monitoring and 
following evasion route 
2.1 Follow evasion 
route 
2.1.1 Record infor 
mation 
• Deviation between planned evasion 
route (set course and speed) and pre 
sent values of ship 
• Distance of actual ship position from 
the planned evasion route 
• Necessary input data for following the evasion route 
2.1.2 Assess infor 
mation 
• Result information from 2.1.1 
• Necessary actions (set values for course/rudder angle 
and speed) in order to follow evasion route 
2.1.3 Act 
• Set course/rudder angle 
• Set speed/ 
speed regulator position 
• Necessary change in course/speed of ship to adhere to 
planned evasion route