Raymarine E90W, User Reference Handbook

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image within the current range. Changes to the range shift are
reflected in all fishfinder windows.
1. Press the RANGE control to open the range toolbar.
2. Press the RANGE softkey repeatedly until the MAN option is
selected.
3. Press the RANGE SHIFT softkey.
4. Select your desired setting using the trackpad.
5. Press
OK .
12.6 Fishfinder presentation options
The PRESENTATION softkey gives you access to a features
and functions which enhance the fishfinder display and provide
additional on-screen functionality.
Presentation options include:
• Gain settings to enhance display clarity.
• Power to the transducer.
• VRM features for measuring depth distance.
• Dual frequency view options.
• Scroll pause and resume.
Sonar gain
The gain settings alter the way the DSM processes background
noise (also called clutter). Adjusting the gain settings can improve
the sonar image, however for optimum performance in most
conditions, we recommend that you use the auto settings.
The gain adjusts the return threshold (echo strength) above which
the fishfinder will show an object on the screen.
There are two gain modes:
• Auto
• Manual
Auto
In Auto mode, the DSM sonar automatically adjusts the gain setting
to suit current conditions. Any adjustments made apply to all
fishfinder windows using that particular frequency.
There are three Auto modes, each suited to different scenarios:
Using the fishfinder
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