Northstar Explorer 435/438 Installation and Operation Manual 9
Gain Adjustment
Gain (sensitivity)
controls the amount
of detail displayed on
the screen. Refer to
section 4-3 for more
information.
1. Press briefly
to show the gain
controls.
2. Press or to
adjust gain.
3. Press
to switch between auto and manual
gain.
4. Press
or MENU to confirm and exit.
Display Adjustment
The display and keys
are backlit, with a
choice of 16 bright-
ness levels. To change
the backlight level:
1. Press twice to
show the backlight
control.
2. Press to dim or
to brighten.
3. Press
to confirm.
Power Off
To turn the fishfinder off, hold . A countdown
box appears. Continue to hold for 3 seconds
until the fishfinder turns off.
Note: If the unit is wired for Auto Power (section
6-4 Wiring options) the fishfinder can be turned
off only when the boat’s ignition is turned off.
Simulate Mode
An internal simulator allows
users to learn how to operate
the fishfinder off the water.
In Simulate mode the word
Simulate flashes at the
bottom of the display. The
fishfinder generates data
so that all the main displays
appear to be operational.
Use Setup > Simulate as follows:
1. Press MENU twice to show the Setup menu.
2. Highlight Simulate.
3. Press
to select On or Off.