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

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1. RADAR OPERATION
1-46
1.28.2 Trail time
Trail time, the trail plotting interval, may be chosen as follows:
1. Roll the trackball to place the arrow on the TRAIL MODE box at the bottom
right corner of the screen.
* TRAIL **
* = TRUE or REL
** = Trail time setting
TRAIL MODE box
2. Push the left button to choose plotting interval from among OFF, 15 s, 30 s, 1
min, 3 min, 6 min, 15 min, 30 min or CONT(INUOUS) and then push the
wheel. (To choose intervals between 30 s and 30 min, in increments of 30
seconds, roll the wheel.) The longer the trail interval the longer the length of
the target trail.
The maximum time for continuous plotting is 99:59. When the timer counts to
99:59, the timer is reset to zero, all target trails are erased and then trails are
restarted.
1.28.3 Trail gradation
The afterglow can be selected in a single tone or gradual shading.
Monotone
(Single)
Gradual shading
(Multi)
Trail gradation
1. Roll the trackball to place the arrow on the TRAIL MODE box at the bottom
right corner of the screen.
2. Push the right button to display the TRAIL menu.
3. Roll the wheel to choose 2 TRAIL GRAD and then push the wheel or the left
button.
4. Roll the wheel to choose SINGLE (single) or MULTI (multiple) as appropriate
and then push the wheel or the left button.
5. Push the right button to close the menu.