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.
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.
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.
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.
5-5 Sonar A-Scope 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.
Divider line
between sonar
history and
A-scope
Gain setting
(strongest echo for
display)
Gain threshold
(weakest echo for
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.
Northstar
Explorer 443d/443df
Installation and Operation Manual
26
Summary of Contents for EXPLORER 443D
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