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Using echosounder | 47
Viewing sounder history
Whenever the cursor is shown on a sounder panel, the red scroll bar is also shown. The
scroll bar shows the image you are currently viewing in relation to the total echosounder
image history stored.
When the scroll bar is on the far right side it indicates that you are viewing the latest
soundings. If you move the cursor to the left side of the screen the history bar will start
scrolling towards left, and the automatic scrolling as new soundings are received will be
turned off.
To resume echosounder scrolling, move the cursor to the right until the red history bar
reaches the right side of the image, or press the X key.
Measuring distance
The cursor can be used to measure the distance between the position of two
observations on the sounder image. It is easier to use the measure function when the
sounder image is paused.
Use the following process to measure a distance:
1 Move the cursor to the rst
measuring point
2 Start the Measure function
3 Move the cursor towards the second
measuring point
- A line will be drawn from the first
point to the cursor, and the distance
will be listed in the Information
window
You can reset the measurement by pressing the Tick key.
When you press the X key the echosounder will resume to normal scrolling.
Optimizing the echosounder image
Several parameters can be adjusted to
optimize the sounder image.
Gain
The gain controls the sensitivity of the
echosounder.
The more you increase the gain, the
more details will be shown on the
image. However, a higher gain setting
may introduce more background clutter
on the image. Conversely, if the gain
is set too low weak echoes may not be
displayed.
Auto gain
The Auto gain option will keep the sensitivity at a level that works well under most
conditions.
With the gain in auto mode, you can set a positive or negative offset that gets applied to
the auto gain. This is indicated as A-40 - A40.
Color
The strength of the echo is symbolized by colors. A strong return will be shown with
reddish-brown color, while a weak signal will be light blue (depending on which palette
you select).
The more you increase the Color, the more echoes will be displayed as reddish-brown.
MENU WIN
48


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