Furuno CH-300 Operator's Manual page 47

Detection area
Inner boundary
When a target of red or reddish-brown color is detected in the zone, the target lock
indicator blinks, the buzzer sounds and the detection area disappears. When a tracked
target is lost, the operation shown below is repeated.
Tilt changed to search [(A
Detection area displayed once again and target
lock indicator lights.
3. If the target does not appear even though the tilt angle is changed, adjust the SECTOR
and TRAIN controls to change the detection area.
4. To turn off the target lock, press the TARGET key again. The message "LOCK END"
appears for three seconds at the screen top, the target lock indicator disappears and
operation continues with current train and tilt settings.
Manual tracking
1. Set LOCK MODE to MANUAL on the HORZ menu.
2. Press the TARGET key when a wanted target echo appears.
The message "ECHO LOCK" appears along with the target lock indicator. Then, the
transducer train direction is reversed
and searching starts with the current
tilt angle. When a target echo
appears the transducer train
direction is again reversed
automatically, the buzzer sounds and
the target lock indicator blinks.
If the fish echo is lost the tilt angle
is automatically changed to
continue tracking as shown right.
4. To quit the target lock, press the TARGET key again. The message "LOCK END"
appears momentarily.
Outer boundary
Target lock area
+ 10 ) (A - 10 ) A]
A Tilt angle at start of target lock
1. Tilt angle is changed by +10
(A is the tilt angle used when tracking began.)
2. Tilt angle is changed by -10
3. If the echo could not be found, tracking is
cancelled and tilt angle A is restored.
2. HORIZONTAL MODE
Target lock
indicator
NAV
DATA
(A+10 ).
(A-10 ).
2-21