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TRACKFISH 6600 Installation and Operation Manual 35
NAVMAN
Shadows
Shadows are created around areas where the ultrasonic beam cannot ‘see’. These areas include
hollows on the bottom or beside rocks and ledges, where the strong echoes returned off the rocks
obscure the weak echoes of the sh and may also create a double bottom trace. See following
for an example of the sonar display in such an environment. A double bottom trace is shown on
the display.
When looking for sh with the wide angled 50 kHz frequency, be aware of increased shadows. Use
the high frequency 200 kHz in areas that have rocks and ledges because this frequency reduces
the shadow effect considerably.
Frequency and cone width
Sonar display of same area
sh is visible on the display
sh is hidden by the strong echoes off the
bottom and is not shown on the display
Example of shadows
sh is visible on the display
Water Cone width Cone width
Depth at 50 kHz at 200 kHz
25 20 5
50 40 10
100 80 20
150 130 30
200 170 40
300 250 60
400 330 80
600 500 120
800 660 150
1000 830 190
45° cone
11°
cone
The sonar pulse
generated by
the TRACKFISH
transducer travels
down through the
water, spreading
outwards in a cone
shape. The cone width
is dependent upon
the frequency of the
pulse; at 50 kHz it is
approximately 45°,
and at 200 kHz it is
approximately 11°.
The differences in
the cone width affect
what is displayed. See
section 8-3.
34


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