Using White Line; Adjusting Display Gain (Sensitivity) - Raytheon HSB L760 Owner's Handbook Manual

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It is also possible that the sound waves are making two complete trips – hitting
the bottom, bouncing off the boat, then reflecting off the bottom again; this can
happen if the water is shallow, the bottom is hard, or gain is set high.

Using White Line

The White Line feature separates echoes from fish near the bottom and the
bottom itself. When the White Line is switched on, the Fishfinder displays the
echoes differently:
L755 – the weakest echoes continue to be displayed in the background color
white, but colors for the other signal are reversed. Thus, from the strongest to
the second weakest the colors are: light gray with a thin black line on top, dark
gray, black.
L760 – 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:
MULTI
1. Press the MULTI key, the WHT LINE soft key is displayed.
WHT LINE
2. Press the WHT LINE soft key to toggle the white line feature ON or OFF.
OFF ON

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 and you can fine-
tune the auto-gain setting. You adjust gain for each transducer frequency
independently.
The color bar on the right hand side of the display, when set to ON in the
Fishfinder Set Up menu (see Section 7.4), shows the colors being used, with
strongest echo color at the top and the weakest echo color at the bottom. The
height of each bar indicates the range of signal strengths displayed in that
color.
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. However, any
fine-tuning you make to auto-gain is removed when the unit is powered off.
HSB Series L755 and L760 Fishfinder