Furuno CHS-5LMARK-2-55, Operator'S Manual

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4. ECHOSOUNDER MODE
4-5
4.7 Erasing Weak Echoes
Sediments in the water or reflections from plankton may be painted on the screen in
green or light-blue, as shown in the illustration below. These echoes may be erased
in order of strength as below.
Weak echoes
1. Press the MENU key to open the menu.
2. Use the RANGE control to choose [MENU MODE] at the top of the screen.
3. Use the GAIN control to choose [SOUNDER].
4. Use the RANGE control to choose [DELETE COLOR].
5. Use the GAIN control to choose setting desired. The setting range is 0-10, and the
higher the setting the stronger the echo that will be erased.
6. Press the MENU key to close the menu.
4.8 Other Items on the Sounder Menu
The table below describes the SOUNDER menu items not described in the previous
sections of this chapter.
Sounder menu description
Item Description Ref. page
COLOR Choose one of four display color patterns, according to your environ-
ment. —
COLOR CURVE Adjusts echo presentation color curve against strong reflections. For
example, setting "1" averages weak to strong signals to obtain a bal-
anced picture. The larger the setting the better the resolution on weak
signals.
—
DRAFT Set ship's draft to get depth from the sea surface (rather than from the
transducer). —
Weak reflections