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TRACKFISH 6600 Installation and Operation Manual34
NAVMAN
8-2 Interpreting the display
The sonar displays do not show a xed distance
travelled by the boat; rather, they display a
history, showing what has passed below the
boat during a certain period of time.
The history of the sonar signal displayed
depends the depth of the water and the scroll
speed setting.
In shallow water, the echoes have a short
distance to travel between the bottom and the
boat. In deep water, the history moves across
the display more slowly because the echoes
take longer to travel between the bottom and
the boat. For example, when the scroll speed
is set to Fast, at depths over 1000 ft (300 m)
it takes about 2 minutes for the data to move
across the display, whereas at 20 ft (6 m) it
takes only about 25 seconds.
The scroll speed can be set by the user to
display either a longer history with less sh
information or a shorter history with more sh
details (see section 15-3).
If the boat is anchored, the echoes all come
from the same area of bottom. This produces
a at bottom trace on the display.
The screen shot shows a typical sonar display
with the Fish symbols turned Off.
Bottom
Large
school of
sh
Strength of echoes
The colours indicate differences in the strength
of the echo. The strength varies with several
factors, such as the:
Size of the sh, school of sh or other object.
Depth of the sh or object.
Location of the sh or object. (The area
covered by the ultrasonic pulse is a rough
cone shape and the echoes are strongest
in the middle.)
Clarity of water. Particles or air in the water
reduce the strength of the echo.
Composition or density of the object
or bottom.
Note: Planing hulls at speed produce air
bubbles and turbulent water that bombard
the transducer. The resulting ultrasonic noise
may be picked up by the transducer and
obscure the real echoes.
Single sh
Kelp / Weed
Hard
bottoms
such as
rock or coral
show as
wide bands
Soft bottoms
such as mud,
weed and
sand show
as narrow
bands
Bottom types
Mud, weed and sandy bottoms tend to
weaken and scatter the sonar pulse, resulting
in a weak echo. Hard, rocky or coral bottoms
re ect the pulse, resulting in a strong echo.
See section 9-3.
Small
school of
sh
33


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