168 
Process: 
2. Monitoring and execution of the voyage 
Name 
Date 
Created: 
Mathes 
26.2.98 
Data flow: 
Current voyage plan 
Checked: 
1. Origin 
• The origin of the current voyage plan must be known. 
2. Validity 
• The current voyage plan must be checked before the start of the voyage. This relates to all at 
tributes of the voyage plan (s.). 
• The result of the check must be made accessible to processing procedures. 
• The scope of the check is obtainable from Process 1.2 “Checking the voyage plan” 
• Each change entails a loss of validity; this concerns in particular any changes in the voyage 
plan itself and changes to the geographical planning basis. 
3. Quality 
• The accuracy of the voyage plan must correspond to the required and practicable accuracy of 
the navigation process. 
• The data of the voyage plan must be sufficiently up-to-date, and compatibility between the 
situation in planning and the current situation during voyage execution must be checked. 
4. Harmonisation 
• The geodetic datum used as a basis in the voyage plan must be made available to processing 
procedures. 
• The geodetic datum from planning must be identical to the datum of position determination. 
• Reference systems for planned set courses and speeds must be known. 
• It must be known whether the planning was carried out on a rhumb line or great circle. 
• Planning data must be capable of being checked for practicability with the aid of the current dy 
namic properties of the ship. 
• Any limits set must be compatible with the ship’s parameters; this applies in particular to 
ship dynamics and dimensions, as well as the accuracy of the sensor technology used. 
5. Criticality 
• It must be ensured that the current voyage plan cannot be deleted. 
• Parameters of the track section currently being followed - defined by last way point, way 
point currently being steered towards, and following way point - must not be modified. 
6. Limit values and alarm facilities 
• Alarm, if voyage plan being used is older than the existing sea chart data. 
7. Representation/display 
• Both a graphical and an alphanumeric representation of the voyage plan must be available. 
• The graphical display is intended to enable the planned voyage (i.e. particularly the track) to be 
related to the geographical boundary conditions (to the particular sea region).