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TRACKFISH 6600 Installation and Operation Manual36
NAVMAN
Sonar frequencies
The TRACKFISH has two sonar frequencies,
200 kHz and 50 kHz. To select the sonar
frequency to use, set Frequency (see
section 15-3).
When to use 200 kHz
The 200 kHz frequency is especially suitable
for use in shallow and medium depth water,
typically less than 500 ft (150 m) and while
running at speed.
At 200 kHz, the narrow cone reduces any noise
caused by air bubbles.
The 200 kHz frequency generates a higher
de nition pulse which produces little shadow
and returns excellent detail over a small area
of bottom. Therefore, it gives excellent bottom
discrimination capability and is particularly good
at showing individual fish, including bottom
dwellers.
When to use 50 kHz
The 50 kHz frequency is particularly suitable for
use in deep water, typically greater than 500 ft
(150 m).
At 50 kHz, the cone covers an area of water
about four times wider than the 200 kHz cone
and penetrates to a greater depth with minimal
loss of the return signal.
However, it produces a lower de nition display
with more shadow compared to the 200 kHz
frequency. This means that a group of small
sh, for example, could be displayed as a single
item, while any sh very close to the bottom
may not be found at all.
This frequency is useful for getting a deep,
wide overview of the area so that any areas of
wide angle,
less detailed
50 kHz cone
narrow angle,
more detailed
200 kHz cone
8-3 Single and Dual frequency fishfinding
interest can be identi ed and then examined in
detail with the 200 kHz frequency.
When to use Mixed
The Mixed frequency combines the 200 kHz
and the 50 kHz echoes on one sonar display,
lling in detailed echoes in the centre of the
sonar cone.
When to use 50/200 kHz
Operating the TRACKFISH at both 50 kHz
and 200 kHz simultaneously on a split display
can be very useful when operating in shallow
to medium water, typically less than 500 ft
(150 m), because the 50 kHz section of the
display shows the general area, while the 200
kHz section can be viewed simultaneously for a
more detailed look at any interesting feature.
To use 50/200 kHz, select the Split 50/200
display (see section 9-4).
35


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