Furuno CH-250 - Manual (Page 38)

2-20
When the fish echo is lost the tilt angle is automatically changed as below to continue tracking
the echo:
Tilt changed to search [(A + 10˚)
→
(A - 10˚)
→
A]
Detection area displayed once again and target
lock indicator lights.
A
:
Tilt angle at start of target lock
5. 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 echo tracking mode
1. Select ECHO following the procedure in paragraph 2.12.1.
2. Select LOCK MODE to MANUAL on the HORZ menu.
3. 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 below.
1. Tilt angle is changed by +10˚ (A+10˚).
(A is the tilt angle used when tracking began.)
2. Tilt angle is changed by -10˚ (A-10˚).
3. If the echo could not be found, tracking is
cancelled and tilt angle A is restored.
4. To quit the target lock, press the [TARGET] key again. The message “LOCK END” appears
momentarily.