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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 fish school,
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