Raymarine L1250DRC, Owner'S Handbook Manual

Page: 135 / 246

Chapter 6: Sonar Operations 6-5
A
dju
st
in
g D
is
pl
ay
Gai
n (S
en
siti
vity
)
With color LCDs, the strongest echoes are displayed in the background color
with a thin line on top. All other echoes remain unchanged.
➤
To switch the white line feature on and off:
1. Press the
MULTI
key. The
WHT LINE
soft key is displayed.
2. Press the WHT LINE soft key to toggle the white line feature ON or OFF .
Adjusting Display Gain (Sensitivity)
The fishfinder provides controls for
GAIN
,
COLOR GAIN
, and
STC
. These
controls, accessed from the
GAIN
key, are used to reduce background noise
and determine how different strength echoes are shown. Automatic
adjustment of
GAIN
or
COLOR GAIN
is available, alternatively you can
manually adjust any of these parameters using the trackpad.
Note: Automatic Gain settings take advantage the hardware’s advanced dig-
ital technology. As a result, the sounder typically performs better in automatic
mode than manual.
For better performance Raymarine recommends select-
ing AUTO mode for all Gain options.
If you change the settings, the new
GAIN
,
COLOR GAIN
, or
STC
values and
mode (auto or manual) remain set even when you turn off the display.
You adjust gain for each transducer frequency independently. Press the
GAIN
ADJUST soft key to highlight the frequency for which you are making
adjustments. You may change settings for one frequency while displaying the
other.
➤
To adjust a parameter:
1. Press the
GAIN
key. The gain sliders are displayed. The slider last used is
highlighted (displayed in inverse video) to show that it is selected.
2. If necessary, press the
GAIN ADJUST
soft key to select the desired frequency
for adjustment.
3. If necessary, press the desired soft key to highlight (select) the desired slider.
Press it again, if necessary, to toggle between
AUTO and MANUAL
modes.
4. In manual mode, use the trackpad to move the selected slider up or down.
You can press and hold the trackpad to move the slider quickly rather than
in single steps.
MULTI
WHT LINE
OFF ON
GAIN
ADJUST
200 50
75%
CRUISING
COLR GAIN
STC
MANUAL
AUTO
45%
GAIN
A
U
T
O
GAIN
ADJUST
200 50
MULTI GAIN
GAIN
ADJUST
200 50
81213_1.book Page 5 Monday, March 17, 2003 1:14 PM