Furuno CH-250 User Manual

Page 40

2-22

CLUTTER: Low intensity echoes, often caused by sediments in water, are painted on the

screen as a large number or random dots. This noise can be suppressed. The higher the

number (setting) the weaker the echoes which are erased.

RES. COLOR: Sets transfer characteristics of input signal level versus display echo level. Echo

strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG, and you can observe the

characteristics of each by watching the color bar as you change the setting.

LOG:

Displays weak to strong echoes in their respective levels. This is the default setting,

and is suitable for general use.

LINEAR: Downplays the weak echoes when compared with LOG. Effective for suppressing

weak echoes such as plankton.

SQUARE: Strong echoes are emphasized more than in LINEAR.

CUBE:

Strong echoes are emphasized even more than in SQUARE.

TARGET KEY: Selects target lock function among reverse, position and echo. Default setting is

REVERSE. For further details see paragraph 2.12 on page 2-17.

LOCK MODE: Selects how to track fish echo in ”echo” target lock; automatically or manually.

Default setting is AUTO. For further details see paragraph 2.12 on page 2-17.

AUTO TILT: Turns automatic tilt on or off, and the default setting is OFF. The choices are

, and

. Automatic tilt adjusts the tilt angle in the following sequence:

→

(B-A)

→

(B+A)

→

(B-A)

→

(B+A)…

B: Current tilt angle

A: Auto tilt setting

For example, the tilt angle is 30

and the automatic tilt setting is 4

. Then, the tilt angle is

changed in the following sequence: 30

° →

°→

° →

…

Note: The [TILT] control is inoperative when automatic tilt is active.