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Gain
Threshold
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4-4 Gain
Gain (sensitivity) controls the amount of
detail displayed on the FISH 4432/4433.
Understanding how to set suitable
Gain settings is important for optimum
performance.
The Navman fishfinder has three gain modes,
Cruising, Fishing and Manual.
• Cruising Mode
Use this mode to show only the bottom and
large fish.
• Fishing Mode
Use this mode to show as much detail as
possible.
• Manual Mode
The gain can be adjusted by the user to
compensate for water depth and clarity.
High Gain settings may amplify the normal
background noise until it appears as random
pixels.
Changing between Cruising, Fishing
and Manual
To change between Cruising, Fishing
and Manual
1. From any Sonar display, press ENT.
2. Use the
or cursor keys to highlight
mode option, then use the cursor key
then select desired option from list.
Adjusting Gain and Threshold settings
The gain settings and the threshold settings
can be adjusted independently for each
frequency (83kHz and 200 kHz).
Use threshold to eliminate colors in the sonar
display.
1. From any Sonar display, press ENT.
2. Use the
or cursor keys to highlight the
desired setting, then use the cursor key
to change it.
Note: The Gain mode automatically changes to
Manual Gain if the gain or threshold settings are
adjusted by the user.
Obtaining the best results
To obtain the best detection capability for both
fish and bottom we recommend the use of the
Sonar A-Scope display:
1. Set the threshold to 0%.
2. Adjust the gain until the threshold line is
just to the right of the unwanted noise.
Gain line
• It is difficult to get fish arches in shallow water as the transducer sonar beam is very narrow near
the surface and fish do not stay within the beam long enough to display an arch. Several fish in
shallow water tend to display as randomly stacked blocks of pixels.
• Wave motion may result in distorted fish arches
FISH 4432/4433 Installation and Operation Manual 22
NAVMAN