Using White Line; Adjusting Display Gain (Sensitivity) - Raymarine DSM300 User Manual

Chapter 5: Sonar Mode Operation
The frequency of the transducer
The same target will appear differently when the transducer frequency is
changed. Generally, the lower the frequency the broader the image.

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 sounder displays the
echoes differently.
On color LCDs, the strongest echoes are displayed in the background color with a
thin line on top. All other echoes remain unchanged.
On monochrome displays, 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.
➤
To switch the white line feature on and off:
MULTI
1. Press the MULTI key (knob). 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 sounder provides controls for GAIN, COLOR GAIN, and STC. These controls,
accessed from the GAIN key (or GAIN knob on radar CRT units), are used to
reduce background noise and determine how different strength echoes are
shown. You can set automatic adjustment of each of these parameters or
manually adjust the settings using the trackpad.
GAIN
Note: Automatic Gain settings take advantage the hardware's advanced digital technol-
ogy. As a result, the sounder typically performs better in automatic mode than manual. For
better performance Raymarine recommends selecting 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.
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