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41Northstar Explorer 657 Installation and Operation Manual
9-1-1 Extended history mode
To review an old sonar echo, use or 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 to return to the most
recent echo.
The digital depth shown is always the current
depth, even in extended history mode.
The History Position Bar indicates the age of the
most resent echo on the screen, and the position
of the current screen in the recorded history.
History position bar
9-2 Sonar Zoom and Full Screen Zoom displays
These windows show a zoomed section of the
sonar history. The Sonar Zoom display shows
the sonar history on the right and the zoomed
section on the left. The Full Screen Zoom display
shows the zoomed section only.
The zoom bar on the far right shows the area of
the history that is magnified in the zoom section:
• Press
or to adjust the zoom range
(the range of depths included in the zoom
section).
• If Bottom lock is on, the zoom depth
(the depth of the zoom section) is adjusted
automatically so that the bottom is always
displayed in the zoom section.
If Bottom lock is off, press
or to
manually adjust the the zoom depth.
Bottom lock
To turn Bottom lock on or off:
1 Press
and select Bottom lock.
2 Select On or Off.
or If Bottom lock is on, pressing
or
will turn it off.
DE
A Divider line
B Depth line marks the center of the zoomed
area
C Zoom bar
D Zoom section
E Sonar history
A
B
C