Humminbird Fish Finder 409000-1 User Manual

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4. If the unit is working properly, gradually increase the boat speed to
test high-speed performance. If the unit functions well at low
speeds but begins to skip or miss the bottom at higher speeds, the
transducer requires adjustment. Angling the rear of the transducer
downward and/or lowering the transducer farther into the water
will help achieve depth readings at high speeds. If the left side of
the fish arch is longer than the right side, then the back of the
transducer is angled too far downward. If the right side of the fish
arch is longer than the left side, then the back of the transducer is
angled too far upwards.
NOTE: It may not always be possible to get symmetrical fish arches and high
speed depth readings at the same time. Due to the wide variety of boat hulls,
however, it is not always possible to obtain high speed depth readings.
NOTE: It is often necessary to make several incremental transducer adjustments
before optimum high speed performance is achieved.
Once you have reached a consistently good sonar signal at the desired
speeds, you are ready to lock down the transducer settings.
5. Mark the transducer bracket location on the transom with a pencil,
then pop up the bracket to reveal the mounting screws. Tighten
the stainless steel mounting bracket screws to secure in place.
Hand-tighten only!
GPS Receiver Installation Overview
To optimize performance of the GPS receiver, mount it in an area that has
full exposure to the sky. The effective area of reception is 10° above the
horizon. Different circumstances determine the mounting method
appropriate for your GPS receiver.
If you have… Then use:
The pinouts of the pigtail cable are as follows:
• Red Wire, +12V (output voltage only)
• Black Wire, Ground
• White Wire, NMEA Out.
CAUTION! Please use caution before connecting the red +12V wire to any
other NMEA device. This is an output voltage provided by the Fishfinder unit
and GPS receiver and should only be connected to those NMEA devices that
need a 12 volt input.
An existing antenna stem with
standard 1" – 14 thread stem
Access for cable routing under
the mounting location
No access under the mounting
location
Stem Mount with Existing 1” -
14 Thread Stem
Access Under Mounting
Location
No Access Under Mounting
Location
GPS Receiver Installation Overview

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