Sonar Bottom Display; Sonar 83/200 Display; Sonar A-Scope Display - NorthStar EXPLORER 443D Installation And Operation Manual

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5-3 Sonar Bottom display

To show the Sonar Bottom display, press DISP
and select Sonar Tab, select Sonar Bottom
and press ENT.
This shows a split display, with the sonar history
on the right side and the zoom section on the
left. The bottom signal is shown as a flat trace in
the centre of the zoom section.
Showing the bottom as a flat trace can make it
easy to compare the echo strengths shown in the
bottom signals. This can help to identify the type
of bottom and objects close to the bottom.
The zoom bar can only indicate the zoom range.
It cannot indicate the zoom offset as this changes
for each sounding displayed on the display.
The zoom bar is fixed in the middle of the display.

5-4 Sonar 83/200 display

To show the Sonar 83/200 display, press DISP
and select Sonar Tab, select Sonar 83/200
and press ENT.
This shows a split display, with the 83 kHz sonar
history on the left side and the 200 kHz sonar
history on the right side. Gain settings can be set
independently for each frequency. Range settings
apply to both sections of the display.

5-5 Sonar A-Scope display

To show the Sonar A-Scope display, press DISP
and select Sonar Tab, select Sonar A-Scope
and press ENT.
Use this to analyse the sonar data in detail and
optimize the Gain settings.
26
Divider line
between sonar
history and
A-scope
Gain setting
(strongest echo for
display)
Gain threshold
(weakest echo for
display)
Northstar Explorer 443d/443df Installation and Operation Manual
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.
Gain is explained in section 4-4 Gain.
Range is explained in section 4-5 Range.
A-scope is explained in section 5-5 Sonar
A-Scope display.
Data header is explained in section 5-1 Sonar
display.
Bottom lock and Split ratio are
explained in section 5-2 Sonar Zoom display.
To change items, press MENU until the
Options menu is shown. Gain is explained in
section 4-4 Gain.
Range is explained in section 4-5 Range.
A-scope is explained in section 5-5 Sonar
A-Scope display.
Data header is explained in section 5-1 Sonar
display.
Split ratio is explained in section 5-2 Sonar
Zoom display.
The user can define the level of the weakest
and strongest echoes to be shown on the
sonar displays, by using the Gain and Threshold
settings. See section 4-4 Gain, for more
information.
The strength of an echo at a particular depth
is shown by the length of the horizontal line at
that depth. A strong echo produces a long line
whereas a weak echo produces a short line.
To change items, press MENU until the
Options menu is shown.
Gain is explained in section 4-4 Gain.
Range is explained in section 4-5 Range.
Data header is explained in section 5-1 Sonar
display.
Split ratio is explained in section 5-2 Sonar
Zoom display.

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