Furuno CH-250 manual Echo mode, Automatic echo tracking mode

2.12.4 Echo mode

The echo mode tracks a fish school either automatically or manually. The default setting is automatic, and you can select automatic or manual with “LOCK MODE” in the HORZ menu.

Automatic echo tracking mode

The automatic echo target lock function automatically tracks a fish school appearing in the operator-selected target lock zone. If the tracked fish school goes out of the zone in the range direction, tracking is suspended until it or a new fish school comes into the zone.

To use the automatic echo tracking mode:

1.Select ECHO following the procedure in paragraph 2.12.1.

2.If necessary select LOCK MODE to AUTO (default setting ) on the HORZ menu.

3.Press the [TARGET] key. The dialog box below appears at the screen center, the message “ECHO LOCK” appears for three seconds at the top of the screen, the target lock area appears in the current train area and the target lock indicator appears at the right-hand side of the screen.

TARGET LOCK AREA.

: INSIDE

: OUTSIDE

4.Use the [SECTOR] and [TRAIN] controls and the Omnipad to set the detection area. Do not include bottom echoes in the zone, so that target lock will not be activated by bottom echoes.

When a target of red or reddish-brown color is detected in the zone, the target lock indicator blinks and a buzzer sounds to call the operator’s attention. The [SECTOR], [TILT] and [TRAIN] controls are inoperative since they are automatically adjusted. When you attempt to operate shoes controls the message “TARGET LOCKING NOW.” appears.

Outer limit

NAV

DATA

Inner limit

Figure 2-18 Target lock area

Target lock indicator

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