JW Fishers SCAN-650 Operation Manual page 25

OPERATOR SWITCHES AND CONTROLS (continued)
SCREEN POSITION (under the View Menu and Mode/Screen Toolbar)
The operator can move the origin point (center) of the sweep to any position on the screen to
give a large viewing area. Moving the origin point and increasing the zoom extends the image
from the top to the bottom of the screen. The origin point can also be moved to the corners of the
screen when it is advantageous to do so.
menu, from the Mode/Screen toolbar, or by dragging the origin with the mouse. To drag the
origin with the mouse, position the mouse cursor over the origin. The mouse cursor will change
from an arrow to a set of crosshairs (+). Press and hold the left mouse button down while drag-
ging the origin to the desired location. As the origin is dragged away from the center of the
screen, the Zoom level changes, magnifying the sonar image to a maximum of 200%
Start of Sweep, End of Sweep -
Allows the user to select the sector that will be scanned. The angle can be selected from the
pulldown menus or can be typed into the box. Alternately, the operator can set the "Start of
Sweep" angle by following these steps.
1. Move the mouse cursor to the "Start of Sweep" arm on the sonar display.
2. Press and hold down the right mouse button.
3. Drag the arm to the desired "Start of Sweep"position.
4. Release the right mouse button.
The "End of Sweep" angle can be set in the same maner, but requires the "Shift" key on the
keyboard to be pressed and held before pressing the right mouse button and released only after
the measurement is complete.
With a "Start of Sweep" angle of 300 degrees and an "End of Sweep" angle of 60 degrees
selected, the resulting sweep would cover a total sector of 120 degrees( as shown below).
"Start of Sweep" arm
300°
The screen position can be moved from the "View"
origin point
25
"Start of Sweep" angle
"End of Sweep" angle
60°
"End of Sweep" arm