Factors inuencing the sonar display
The quality and accuracy of the display can be inuenced by a
number of factors including vessel speed, depth, object size,
background noise and transducer frequency.
Vessel speed
The shape of the target changes along with your speed. Slower
speeds return atter, more horizontal marks. Higher speeds cause
the target to thicken and arch slightly, until at fast speeds the mark
resembles a double vertical line.
Target depth
The closer the target to the surface, the larger the mark on screen.
Note: The depth of individual targets can be displayed by
switching on the Target Depth ID in the shnder setup menu.
The number of target depths displayed is inuenced by the sh
alarm sensitivity level.
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 shnder display.
The size of a sh target is also dependent upon the size of the sh’s
swim bladder rather than its overall size. The swim bladder varies in
size between different breeds of sh.
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 shnder picture may be impaired by echoes received from
oating or submerged debris, air bubbles or even the boats
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.
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E-Series Widescreen User reference
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