13 select a split zoom screen, 14 what is zoom range and zoom range shift, 15 change the zoom range shift – NorthStar Navigation NorthStar 8000i User Manual
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Northstar 8000i Operation Manual
The 200 kHz history in the right hand pane
The 50 kHz history in the left hand pane
5. If you want to adjust the size of the panes, (see "Change the ratio of a
split screen" page 109).
6. When you are finished, select Return.
16.13 Select a split zoom screen
You can use a split zoom screen to magnify part of the water column and look at it
in more detail.
It's useful to have the depth line On.
To select a split zoom screen:
1. Display
the
Sounder screen and the control panel. If you can't see the
Range, Zoom and Split button, select Return.
2. Select
Range, Zoom and Split. The View Mode button shows
the current setting.
3. Select the button if you want to change the setting and a drop down
list of choices appears.
4. Select
Zoom. The Sounder screen changes to show:
The history on the right hand side
The zoomed area of water on the left hand side
The numbers at the top and bottom of the zoomed area show the
upper and lower depths of the zoomed area (see "Change the
zoom range" page 121) if you want to increase or decrease the
extent of the zoomed area)
The number in the center of the zoomed area, and the depth line,
show the center of the zoomed area (see "Change the zoom range
shift" page 108) if you want to move this).
5. When you are finished, select Return.
NOTE: If the A-scope is already shown, this will be shown on the split screens too.
16.14 What is zoom range and zoom range shift?
These are available only on a zoomed Sounder screen.
The zoom range is the vertical extent of water that is shown in detail on the left
hand side of the split screen; for example, just 5 m of the water column rather than
the complete water column.
Use the zoom range shift to move the zoom range up into shallower water or
down into deeper water, so that you can show any section of the water column in
detail.
16.15 Change the zoom range shift
This works only on a split sounder screen with a zoomed area. You must have Auto
Range Off.