Furuno CH-270 Operator's Manual page 42

2. HORIZONTAL MODE
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.
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.
To use the manual echo tracking mode:
1. Choose ECHO following the procedure in paragraph 2.12.1.
2. Choose 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 as below to continue
tracking.
1. Tilt angle is changed by +10° (A+10°).
(A is the tilt angle used when tracking began.)
2. Tilt angle is changed by -20° (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.
2-22
A: Tilt angle at start of target lock