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1-2 How the FISH 4432/4433 works
The FISH 4432/4433 has two parts:
- the transducer attached to the hull
- the display unit.
The transducer generates an ultrasonic pulse
(sound that is above the hearing range of
the human ear), which travels down towards
the bottom at a speed of about 4800 ft/sec
(1463 m/sec), spreading out into a cone shape.
When the pulse meets an object, such as a
fish or the bottom, it is partly reflected back
up towards the boat as an echo. The depth
of the object or bottom is calculated by the
FISH 4432/4433 by measuring the time taken
between sending a pulse and receiving the
echo. When an echo has been returned, the
next pulse is sent.
The FISH 4432/4433 converts each echo into
an electronic signal, displayed as a vertical
line of pixels. The most recent echo appears
on the extreme right of the display, with the
older echoes being scrolled towards the left,
eventually disappearing off the display.
The scroll speed depends upon the water
depth and scroll speed setting. See section 3-2
Setup > Sonar and section 4-1 Interpreting the
display, for more information.
The appearance of echoes displayed are
affected by:
• the fishfinder settings (frequency selected,
range and gain settings)
• echoes (different fish types, different
bottom types, wrecks and seaweed)
• noise (water clarity and bubbles).
See section 4-1 Interpreting the display, for
more information.
If a menu is not displayed then go to the sonar
ESC display. If a menu is displayed then cancel any
changes and return to the previous menu.
DISP Shows the Display menu.
, Cursor keys move the selection highlight and
, change settings.
MENU Press to show the Options menu on a display; press
again to show the Setup menu.
ENT Confirms any changes or from a sonar display shows
the Gain controls.
+ Increases the Range.
— Decreases the Range.
AUTO Select fishing/cruising or manual operating mode
Powers On and Off; shows the Backlight control.
2 Basic Operation
Key Names
FISH 4432/4433 Installation and Operation Manual7
NAVMAN