NorthStar Navigation NorthStar 8000i - Manual (Page 102)

102 Northstar 8000i Operation Manual
You can change the:
•
scroll speed
•
palette
•
position of the depth line
•
sounder operating mode
•
zoom range
•
zoom range shift
•
ratio of a split screen
•
ratio of the A-Scope
You can select and view a:
•
50 kHz, 200 kHz or a mixed frequency screen
•
split zoom screen
•
split bottom lock screen
•
split 50/200 screen
16.1 Display the sounder screen
To display the sounder screen:
1. You can either:
ƒ select Display, then select Sounder;
ƒ select a page that includes the Sounder screen and make this the
active pane.
2. The 8000i displays the Sounder screen, with the Sounder control panel
on the right hand side of the screen.
16.2 What does the sounder screen show?
The Sounder screen shows each echo as a vertical line of pixels. The most recent
echo is on the right, with the older echoes being scrolled towards the left and
eventually disappearing. This is known as the "history".
The echoes can be returned from 50kHz only, from 200 kHz only, or from both of
these frequencies mixed together.
The band of color scrolling from right to left shows the bottom; and any fish (or
other objects) in the water are shown as fish arches.
You can turn the A-Scope On or Off. If it's On, horizontal lines of rapidly moving
color on the right show the sonar echoes in detail. You can adjust the minimum
and maximum gain amplitudes using the two vertical lines shown in the advanced
A-Scope screen.
A depth scale is shown at the extreme right of the Sounder screen.
IMPORTANT: The depth scale is shown as the DBT (Depth Below Transducer).
The Sounder screen can be split (as in this example picture) to include a zoomed
area, or locked to always include the bottom. When it's split, you can change the
ratio of the split screens.