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3-1
3. ADVANCED SONAR OPERATION
3.1 Tracking a Fish School (target lock)
Target lock, which requires speed and heading inputs, automatically tracks a
fixed location (such as a reef) so that you won’t lose sight of it on the display
screen.
1. On the sonar display, operate the trackball to place the trackball mark on the
location you want to track.
2. Press the [TARGET LOCK] key.
The target lock mark appears (
) on the echo selected and the bearing
mark bisects the echo. Horizontal range, depth and bearing to the target
appear at the bottom right hand corner of the sonar display. Note that target
lock is automatically cancelled when the echo moves 1.5 times the range in
use.
Target Lock Data
Target Lock Mark
NNE (Relative bearing to target*)
B
650 (Horizontal range from own ship to target)
153 (Depth of target)
Target lock
bearing mark
* Relative bearing format may be selected with
OTHER MARKS on the MARKS menu.
** Any value which exceeds 9999 is displayed
with four asterisks (****).
Target lock mark and target lock data
3. To cancel target lock and erase the target lock mark and bearing mark, press
the [TARGET LOCK] key again.
Note 1: If automatic tilt is active it is automatically cancelled. It is resumed once
target lock is disabled.
Note 2: Target lock feature is cancelled when the position selected is more than
1.5 times the range.