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OPERATOR SWITCHES AND CONTROLS (continued)
TOOL BARS: (CONTINUED)
Controls Toolbar - Shown at the bottom of the sonar screen. Clicking on "Controls Toolbar" under
VIEW at top of page, user can select which controls are shown at the bottom of the page. The
operator adjustable controls are:
• Frequency - allows the operator to select the frequency on a dual frequency side scan.
• Range - available range settings in meters are; 5,10,25,50,75,100,200,300,400,500, 600. On
the 600K frequency setting only the 5, 10, 25, 50, and 75 meter range settings are displayed.
• Delay - It delays displaying the image for 1,2,5,10,15,20, or 25 m (operator selectable). Com-
monly called water column removal. Eliminates the displayed image for the period of time that
the signal takes to reach the bottom.
• Boat Speed - a boat speed from 1 to 5 knots can be selected, or select Auto Speed. If Auto
Speed is selected, the speed from the GPS will be displayed in the Boat Speed box. Auto
Speed compensates for boat speeds of 1/2 to 5 knots. Speeds less than 1/2 knot or greater
than 5 knots result in image distortion. Low boat speeds produce the best images.
• Threshold - Changes the overall baseline of the returned signal so that even the smallest signal
is visible on the monitor. Threshold is selected by clicking on the up or down arrows on the right
hand side of the box showing the threshold number to scroll through the 256 settings (0-255).
• Left gain - Increases or decreases the size of the signal coming from the towfish and shown as
the sonar image on the left side of the monitor. The shade of the colors on the screen change as
the gain changes. The gain can be adjusted from -10 to +10 in one digit increments by clicking
on the up or down arrows on the right hand side of the box showing the gain number.
• Right gain - Increases or decreases the size of the signal coming from the towfish and shown
as the sonar image on the right side of the monitor. The shade of the colors on the screen
change as the gain changes. The gain can be adjusted from -10 to +10 in one digit increments
by clicking on the up or down arrows on the right hand side of the box showing the gain number.
• Colors - there are seven different color schemes are available. The color shade furthest to the
left is displayed with low amplitude signal returns and the color shade furthest to the right for
hard returns.
• Invert Colors - Inverts the selected color scheme effectively doubling the number of color choices
• Playback Speed Slider- Controls the playback speed of a previously recorded file.
• Towfish Layback- The GPS position captured by Sonar View is the position of the GPS
antenna. The towfish layback control allows the operator to enter the distance between the GPS
antenna and the towfish, resulting in more accurate target (cursor) position calculations. Layback
is stored as part of the Sonar image file.
On the bottom of the screen are two status bars. One bar displays the boat's position (latitude and
longitude), compass heading, nautical speed, and the position (latitude and longitude) of the mouse
arrow on the screen. The other bar displays the time, date, and run time of the file.
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