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TRACKFISH 6600 Installation and Operation Manual 33
NAVMAN
8-1 Using the TRACKFISH
The TRACKFISH uses a sonar transducer
attached to the hull. 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
sh or the bottom, it is partly re ected back
up towards the boat as an echo. The depth
of the object or bottom is calculated by the
TRACKFISH 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 TRACKFISH 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 sections
15-3 and section 8-2, for more information.
The appearance of echoes displayed are
affected by:
the TRACKFISH settings
(see section 8-5)
echoes (different sh types, different
bottom types, wrecks and seaweed; see
section 8-2)
noise (water clarity and bubbles; see
section 8-2).
Cruise, Fishing and Manual
Modes
The TRACKFISH has three sonar
operating modes:
Cruise mode: Use this when on the
move. The TRACKFISH automatically
adjusts its settings to compensate for
water clarity and to display the bottom.
Fishing mode: Use this when shing.
The TRACKFISH automatically adjusts its
settings to compensate for water clarity
and to best display sh, the bottom and
other details.
Manual mode: Use this to ne-tune
the TRACKFISH settings by hand. Best
results are often achieved in manual
mode, but practice and experience are
required to obtain the optimum settings
for different conditions.
To select an operating mode, press GOTO/
AUTO and select the mode. When you select
Manual mode, the TRACKFISH reverts to your
last manual settings.For more information on
operating modes and the TRACKFISH settings,
see section 8-5.
Warning: Use the automatic Cruise or
Fishing modes when learning to use the
TRACKFISH or when travelling at speed.
8 Sonar fishfinding: Introduction
This section explains how to interpret the sonar
displays, when and why to use the different
frequencies and how sh are detected and
displayed.
It also describes Gain and Range and shows
examples of some of the different sonar
displays.
32


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