Sonar Zoom Display - NorthStar EXPLORER 443D Installation And Operation Manual

To customize the size of the Data header, highlight
Size and press ENT. There is a
choice of Small and Large.
To customize the data items to be displayed:
1. Highlight Data setup and press ENT.
The Data header increases in size to display all
data fields. Some data fields may be blank.
2. Use the cursor keys to move from data field to
data field.
3. Press ENT at any data field to show the list of
data items that can be displayed there.
4. Highlight the required data item and press

5-2 Sonar Zoom display

To show the Sonar Zoom display, press DISP and
select Sonar Tab, select Sonar Zoom and
press ENT.
The split display shows the sonar history on the
right side and the zoom section on the left.
The zoom bar on the far right shows the area that
is magnified in the zoom section. See section 4-5
Range, for information about adjusting the Zoom
Range and Zoom Offset.
To change items, press MENU until the
Options menu is shown.
Sonar history
Zoom bar
Zoom section
Divider line
Northstar Explorer 443d/443df Installation and Operation Manual
ENT. The data item is immediately displayed in
that data field.
5. Press ESC when finished and the Data header
resizes automatically.
Sonar History
To review an old sonar echo, use < and > to move
back and forward through the sonar history. The
time since the echoes shown on the screen were
recorded is displayed at the bottom of the screen.
Press ESC to return to the most recent echo.
Gain
Gain is explained in section 4-4 Gain.
Range
Range is explained in section 4-5 Range.
A-Scope
A-Scope is explained in section 5-5 Sonar
A-Scope display.
Bottom lock
If Bottom lock is selected, the zoom section
moves so the bottom is always displayed in the
zoom section, regardless of changes in depth.
If Bottom lock is not selected, the bottom
will not be displayed in the zoom section when it
is outside the range covered by the zoom bar.
Using the Bottom Lock and the A-Scope features
together can be a powerful aid in recognising the
type of bottom.
Split Ratio
Use this to change the split ratio between the
zoom and the sonar history sections displayed.
The default split ratio is 50%.
1. Highlight Split Ratio and press ENT.
A left arrow and right arrow appear on either
side of the divider line.
2. Use the or cursor keys to adjust the
position of the divider line, then press ENT.
The adjustable range of the split ratio is from
20% to 80%. For 100% zoom, use 'full-screen
zoom' display.
Data header
Data header is explained in section 5-1 Sonar
display.
25