Furuno FAR-21 7-BB Series, Operator'S Manual

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3. ARP OPERATION
3-18
3.9.2 Vector motion and length
Vectors may be displayed in true or relative motion. Vector time (or the length of
vectors) can be set to 30 seconds, 1-15 minutes (in one-minute intervals), 20
minutes and 30 minutes.
By keyboard
1. Press the [VECTOR MODE] key consecutively to choose relative or true
vector mode. Your selection is shown on the Vector motion box. (Note that
this also selects the vector mode for the past position display.)
2. Press the [VECTOR TIME] key consecutively to choose vector time. Your
selection appears in the vector length box (see illustration below).
By trackball
1. Roll the trackball to choose VECTOR TRUE or VECTOR REL (whichever is
displayed) at the right side of the screen.
VECTOR TRUE 15MIN
Vector motion
Vector
time
ARP VECTOR boxes
2. Push the left button to display VECTOR TRUE or VECTOR REL as
appropriate. (Note that this also selects the vector mode for the past position
display.)
3. Roll the trackball to choose the vector time box.
4. Push the left button to display time desired.
The vector tip shows an estimated position of the target after the selected vector
time elapses. It can be valuable to extend the vector length to evaluate the risk
of collision with any target.