103 
3 Summary of model 
The central form of representation of the functional model is constituted by the data flow diagrams (An 
nex 5.2). Starting from the context diagram (Annex 5.1), the “integrated navigation” system is repre 
sented here as a network of processes communicating with one another. In this case, the top-level 
diagram represents the level of the task areas. Starting from this diagram, detailed specification of the 
functionalities and functions is carried out, separated according to tasks. The classification of the annex 
in this case follows the structure already used for the functional analysis (see part A). Figure 12 shows 
this structure and the data flow diagrams developed for modelling the system, in summary form. 
Integrated navigation 
1 Voyage planning 
—1.1 Drafting of 
voyage plan 
- 1.1.1 Record input 
information 
— 1,1,1.1 Record byck. 
Conditions 
— 1.1.1.2 Record met. 
Conditions 
— 1.1.2 Determ ine s peed/time profile 
— 1.1.3 Ran route 
1.1.4 Ran frock 
— 1.1.4.1 Determine local 
circumstances 
— 1,1.4.2 Stipulate track limits 
— l.l .4.3 Stipulate track 
2 Voyage execution 
3 Management of data 
and reference para 
meters 
•2.1 Determining set/ 
actual deviations 
■ 2.1.1 Monitor set 
Track 
— 2.1.2 Monitoring 
of speed 
2,1.3 Monitoring of 
course and 
heading 
2,2 Determining set Vdiues 
i— 2.2.2 Set direction 
1.1.4.4 Determine manoeuvring limits 
-1.2 Check voyage 
plan 
— 1.2.1 Check route 
1.2.2 Check speed/fime profile 
— 1,2.3 Check track 
I—1.2.3.5 Check available 
space 
4 Unplanned 
incidents 
5 Recording of 
current situation 
3.1 Management of vessel 
parameters 
3.2 Management of geo 
graphical date 
— 3.3 Management of navt- 
gatsonci reference 
parameters 
-4,1 Collision avoidance 
-4,2 Grounding avoidance 
-4,3 Evasion of bad 
weather regions 
5.1 Slat© identification 
— 5.!, 1 Determine primary state 
variables 
— 5.M.1 Own ship position 
5.1.1.2 Heading 
5.1.1.3 Longil 5peeda g. 
— 5.1.1.4 Transv. speed o. g. 
— 5.1.1.5 longit. speed t w 
— 5.1.1.6 Transv. speed t. w 
5.1.1.7 Yvbterdepte 
— 5.1.1.8 Rudder angle 
— 5.1.1.9 Engine data 
5.1.1.10 ROT 
I-— 5.1.2 Determine derived state 
variables 
5.1.2.1 Course and speed o, g, 
5.1.2.2 Course and speed t. w. 
— 5.1.2.3 ROT 
— 5.1.2.4 Position 
—5 2 Observing current environment 
situation 
—5.3 Object recording 
Figure 12: Summary of the data flow diagrams of the functional model