Sonar Screen - Navman FISH450 Tricolor Manual De Instalación Y Funcionamiento

3-3 Sonar screen

The Sonar screen displays the depth and strength
of the echos returned from each ultrasonic pulse.
This raw signal is enhanced by the Colouration
and Gain settings and then displayed on the Fish
History or Zoom screen as a single vertical row of
dots.
The key to interpreting the Sonar screen is to look
at the strength (stronger echos project further to
the left) and the depth (distance down the screen)
of the echos.
Strength
Manual Gain adjustment
The Sonar screen displays all echos returned. If
the Manual Gain value is high, the Fish History or
Zoom screens may become cluttered with too
many weak echos. Use Manual Gain to adjust
the level of received echos that are displayed.
Holding the Increase Gain or Decrease Gain key
for one second or longer switches between Auto
Gain and Manual Gain. A dialogue box will
display "Auto Gain" or "Manual Gain".
See the Fish History screen section 3-2 for more
information on Manual Gain adjustment.
10
Small strong echo
(e.g. fish).
These usually flash
on and off as the
ultrasonic pulse
strikes the fish.
Medium sized weak
signal (e.g. school of
small fish).
Large strong signal
(bottom).
NAVMAN
Changing the colour thresholds
The Colouration Bar determines which level
(strength) of echos will be displayed in blue, red
or green on the Fish History and Zoom screens.
To display the colouration bar, press the Cursor
Left or Right key.
• Increase the blue part of the colouration bar
by pressing the Cursor Right key if there are
too few blue (strong) echos being displayed.
• Decrease the blue part of the colouration bar
by pressing the Cursor Left key if there are
too many blue echos
being displayed.
The red and green
portions of the bar graph
share the remaining area
equally.
The bar will automatically
turn off when left for four
seconds.
Increase the blue area by pressing
the Cursor Right key or decrease by
pressing the Cursor Left key
This symbol and number (1 to 9) are
only displayed when in Manual Gain.
FISH450 Tricolor FISHFINDER Installation and Operation Manual
Unwanted weak signals
or 'Noise' (e.g. Bubbles)
Signals to the right of the
colouration bar are not
displayed on the Fish
History or Zoom screens.
Press the Increase Gain
key to move the edge of
the colouration bar to
the right and display
more detail. Press the
Decrease Gain key for
less detail.