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
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
2 Basic Operation
Key Names
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.
7 | NAVMAN | FISH 4432/4433 Installation and Operation Manual |