Raymarine E70085 Dragonfly, Operation Manual

Page: 69 / 96

11.5 Sensitivity adjustments
Settings can be adjusted using the application menu to enhance
the image that is displayed on-screen.
Sensitivity options are:
• Sensitivity
• Contrast
• Noise Filter
• Color Palette
Sensitivity
The Sensitivity setting alters the way background noise (also
called clutter) is processed. Adjusting the setting can improve
the image, however for optimum performance in most conditions,
it is recommended that you use the auto setting.
The Sensitivity setting adjusts the return threshold (echo
strength) at which an object will be displayed on-screen.
The Sensitivity setting can be set to automatic or adjusted
manually:
• Automatic — In Auto mode, the setting is automatically
adjusted to suit current conditions. Any adjustments made
apply to all views using that application.
• Manual — If necessary you can set the sensitivity setting
manually, between a value of 0% to 100%. The higher the
setting the more detail will appear on-screen. This value
should be set high enough to see fish and bottom detail
but without too much background noise. Generally a higher
setting is used in deep and/or clear water; a low setting in
shallow and/or murky water.
The new values remain set even when you switch off the display
and are applied to all views.
Adjusting sensitivity
From the application menu:
1. Select Adjust Sonar or Adjust DownVision .
2. Select Sensitivity .
3. Use the Rotary control to adjust the sensitivity to the
required value, or
4. Press the OK button to switch to Auto mode.
A tick is displayed in the Auto box to signify auto is enabled.
Contrast
You can adjust the Contrast to change the signal strength
threshold for the strongest color / shading.
Contrast sets the lower limit for the strongest echo color / shade.
All echoes with a signal strength above this value are displayed
in the strongest color / shade. Those with a weaker value are
divided equally between the remaining colors / shades.
• Setting a low value produces a wide band for the weakest color
/ shade, but a small signal band for the other colors / shades.
• Setting a high value gives a wide band for the strongest color /
shade, but a small signal band for the other colors / shades.
The Contrast setting can be set to automatic or adjusted
manually:
• Automatic — In Auto mode the contrast setting is
automatically adjusted to suit current conditions. Any
adjustments made apply to all views.
• Manual — You can set the contrast manually, between a
value of 0% to 100%.
The new values remain set even when you switch off the display,
they are applied to both the active view and any other views
containing the same application.
Adjusting the Contrast
From the application menu:
1. Select Adjust Sonar or Adjust DownVision .
2. Select Contrast .
3. Use the Rotary control to adjust the Contrast to the required
value, or
4. Press the OK button to switch to Auto mode.
A tick is displayed in the Auto box to signify auto is enabled.
Noise Filter
The Noise Filter reduces the amount of clutter displayed
on-screen by varying the gain throughout the column of water.
This function is useful for reducing the appearance of ‘noise’.
The Noise Filter can be set to automatic or adjusted manually:
• Automatic — In Auto mode the Noise Filter setting is set to
20%.
• Manual — You can set the Noise Filter manually, between a
value of 0% to 100%.
– A low value decreases the depth at which the filter is
applied.
– A high value increase the depth at which the filter is applied.
The new values remain set even when you switch off the display,
they are applied to both all views.
Adjusting the Noise Filter
From the application menu:
1. Select Adjust Sonar or Adjust DownVision .
2. Select Noise Filter .
3. Use the Rotary control to adjust the Noise Filter to the
required value, or
4. Press the OK button to switch to Auto mode.
A tick is displayed in the Auto box to signify auto is enabled.
Color Palette
Various color palettes are available to suit different conditions
and your personal preference.
• Copper
• Inv. Copper
• Slate Grey
• Inv. Slate Grey
The new values remain set even when you switch off the display,
they are applied to both the active view and any other views
containing the same application.
Selecting a Color Palette
From the application menu:
1. Select Adjust Sonar or Adjust DownVision .
2. Select Color Palette .
3. Use the Rotary control to highlight the Color Palette you
want to use.
4. Press the OK button to confirm the selection.
DownVision application
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