Fishfinder Presets - Raymarine a65 Installation And Operation Instructions Manual

Water depth
As sea depth increases signal strength decreases, resulting in a
lighter on-screen image of the bottom.
Size of the target
The larger the target, the larger the return on the fishfinder display.
The size of a fish target is also dependent upon the size of the fish's
swim bladder rather than its overall size. The swim bladder varies in
size between different breeds of fish.
Transducer frequency
The same target will appear differently when the transducer
frequency is changed. The lower the frequency the broader the
mark.
Clutter / Background noise
The fishfinder picture may be impaired by echoes received from
floating or submerged debris, air bubbles or even the vessel's
movement. This is known as 'background noise' or 'clutter' and is
controlled by the gain modes. The system will automatically control
the gain settings according to the depth and water conditions. You
can however adjust the gain settings manually if you prefer.
Recovering lost bottom
If the seabed floor (bottom) is lost then follow the steps below to
recover the bottom depth.
From the fishfinder application:
1. Ensure your vessel is in clear undisturbed water.
2. If sonar range is set to Manual, adjust the sonar range to the
known, charted depth of your location. or
3. If sonar range is set to Auto then switch range to manual Menu
> Range > Adjust Range > Man and adjust the sonar range to
the known, charted depth of your location.
4. Once the sonar module has regained the bottom you can switch
range mode back to Auto.
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15.8 Fishfinder presets

The fishfinder provides you with four preset configurations available
from the fishfinder menu. These enable you to quickly select
appropriate settings tailored for various situations.
Each preset has been configured to provide the best operating
parameters for the fishfinder. However, it is possible to manually
adjust the presets if necessary. The four default presets are:
• Single — this preset provides quick access to a single-frequency
configuration, suitable for general fishing conditions.
• Dual — this preset provides a dual frequency configuration.
You can either display two different frequencies at the same
time in one window, or display one frequency at full-screen on
your master display and the other frequency at full-screen on an
additional networked display.
• Shallow — this preset optimizes the fishfinder display for shallow
waters.
• Deep — this preset optimizes the fishfinder display for deep
waters.
Display modes
When using presets, you can either select the relevant preset and
start using the default configuration immediately, or you can adjust
and configure each presets display mode:
• Zoom
• Bottom Lock
• A-Scope
Any changes you make to a preset are retained when you switch
off the power to your multifunction display.
Selecting a fishfinder preset
From the fishfinder application:
1. Select Menu.
2. Select Presets.
3. Select the required preset.
The fishfinder display will change to the new mode. This is indicated
in the top left-hand corner of the status bar.
Changing fishfinder preset names
From the fishfinder application:
1. Select Menu.
2. Select Set-up.
3. Select Rename Preset.
4. Select the required characters.
5. Select Save to save the new preset name.
Resetting presets to defaults
To reset the preset settings to factory default values follow the steps
below:
From the fishfinder application:
1. Select Menu.
2. Select Set-up.
3. Select Reset Presets to Default.
A confirmation pop-up is displayed.
4. Select Yes to confirm reset, or No to cancel.
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