5─5
Fig. 5-3 Relative Vector and True vector
Radar and Collision Avoidance
Radar is still playing an important roll for collision prevention and positioning. A plotter is used to further
enhance the radar functionality. The plotter is capable of plotting other positions of other ships in 3 to 6
minute intervals to monitor their movement. The plots of other ships represent their tracks relative to own
ship, and it is shown whether there is a risk of collision, namely CPA and TCPA can be obtained. This method
using a plotter is fairly effective, but the number of target ship, which are manually plotted, is limited and it
takes several minutes to measure those.
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