Furuno CH-270 - Manual (Page 39)

2. HORIZONTAL MODE
2-19
2.12 Target Lock
Three types of target lock modes are available.
Manual reverse: The transducer train direction is reserved manually. This is the default
target lock function setting and it may be used in both horizontal and
vertical scan modes.
Position: Tracks stationary position (such as a reef) using position data from a
navigator. Available in the horizontal mode.
Echo: Tracks fish echo either manually or automatically. Available in the
horizontal mode.
2.12.1 Choosing target lock mode
1. Press the [MENU] key to open the menu.
2. Press ▲ to choose MENU and then press ◄ or ► to choose the HORZ menu.
3. Press ▲ or ▼ to choose TARGET KEY.
4. Press ► to show the following dialog box.
TARGET KEY
REVERSE POS ECHO
5. Press ◄ or ► to choose option desired.
6. Press the [MENU] key to register your selection and close the menu.
2.12.2 Manual reverse mode
The transducer train direction is reversed manually, thereby emphasizing possible fish
echoes.
Note: This function is inoperative in the echo sounder mode. In the vertical scan mode the
manual reverse mode is automatically chosen regardless of the setting in
paragraph 2.12.1.
To activate the manual reverse mode:
1. Choose REVERSE following the procedure in paragraph 2.12.1.
2. Press the [TARGET] key to reverse the transducer train direction when a fish school
appears. “REVERSE” momentarily appears at the screen top when the key is pressed
and then the transducer train direction is reversed.