20. ARPA Target Functions
20-2
20.1.3 Displaying true or relative speed vectors
Targets vector can be displayed relative to own ship's heading (relative vector) or with reference to the North (true
vector). Both presentation modes can be used with relative motion or true motion.
Ground stabilised True Vect (G)) Sea stabilised True Vect (S) Relative vector presentation
Vector time (or the length of vectors) and presentation mode can be set from the information area. Place the cursor
on the item you wish to change, spin the thumbwheel to choose setting and then push the thumbwheel. See the
figure below for location of vector-related items.
True Vect(G) 12 nm
Past PosnTrue 2 min
CPA 1.5 nm 10 min
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