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

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1. OPERATIONAL OVERVIEW
1-16
1.6.2 Sonar menu description
Description of sonar menu
Item Description Ref. page
DISPLAY MODE Chooses the display mode among, [COMBI-1] (NORM
+ Audio), [NORM] (Sonar) and [COMBI-2] (NORM +
Echosounder). 1-6
TX OUTPUT Adjusts transmitter power. 2-4
PULSE LENGTH Chooses pulse length. 2-3
TX CYCLE Removes interference caused by other sonars operat-
ing nearby. 2-6
TVG NEAR Adjusts receiving gain within 300 m. 2-1
TVG FAR Adjusts receiver gain beyond 300 m. 2-1
AGC Automatically reduces the receiver gain only against
strong echoes such as the bottom or a large
school of
fish
, to suppress bottom tail.
2-2
2ND AGC Suppresses bottom echo. 2-3
NOISE LIMITER Suppresses unwanted reflections caused by sediments
in water, plankton or ship's noise. 2-5
COLOR CURVE Adjusts echo presentation color curve against strong
reflections. In setting "1," for example, weak to strong
signals are averaged and displayed to obtain a bal-
anced picture. The larger the setting the better the res-
olution on weak signals. —
COLOR RE-
SPONSE Adjusts color level against strong reflections. The high-
er the setting, the more the red color is displayed and
weak level colors are displayed as is, thereby giving the
appearance that the gain has been raised. —
DELETE COLOR Erases desired echo level from the display. 2-7
ECHO AVER-
AGE Specifies how long to leave afterglow on the screen. 2-7
INT REJECT Rejects random noise and sea surface reflections in
rough sea conditions. 2-5
HOR BEAM-
WIDTH Sets horizontal beamwidth for wide or narrow. 2-7
VER BEAM-
WIDTH Sets vertical beamwidth for wide or narrow. 2-7
COLOR Chooses display colors for the sonar and audio dis-
plays, among four choices. Choose a display color to
match your environment or fishing objective. —
ERASE MARKS Chooses the mark type to erase collectively, from track,
own ship, event and fish. For track, 10% of the oldest
track is erased. 3-7