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RANGE
TRANSDUCERS AND CONE ANGLES
The
range automatically changes
to
keep
the bottom
signal
on the
display
when the unit is in
automatic. The
range
cannot be
changed
when the unit is in the automatic mode. The
range
can be
changed
in
manual mode. There are six
ranges
available:
0-5, 15, 30, 60, 120,
and
180 feet.
(Metric
units:
0-3, 6, 15, 30,
and 45
meters.)
To
change
the
range,
first make certain the word AUTO
is
off.
Then
press
the RANGE
key.
The word RANGE will
flash on the
right
side of the screen.
Next,
press
the
up
arrow
key
to switch to a shallower
range
or
press
the down
arrow
key
for a
deeper range.
The
range
annunciator will
stop
flashing
eight
seconds after the last
key
was
pressed.
ZOOM
-
Automatic
operation
Use the Zoom feature to increase the size of the
targets
on the
display.
It works
by enlarging
the bottom half of the selected
range.
For
example,
if the
range
is 0
-
60
feet
and the zoom
key
is
pressed,
the
new
range
will be 30
-
60 feet. If the unit is in
automatic,
the bottom will
be
tracked in this 30 foot window. There are two
exceptions
to this nile:
1)
If
you're
on the 0-15'
range
and
press
the zoom
key,
the new
range
will be 10-15'.
2)
There is no zoom on the 0-5'
range.
8
The
sound waves from the transducer
spread
out into the water in a
cone
shaped
beam. This looks much like the beam from
a
flashlight.
The
angle
between the outside
edges
of the
cone is the cone
angle.
Lowrance offers a choice of transducers with either an 8 or 20
degree
cone
angle.
Typically,
wide cone
angle
transducers
(20 degrees)
are
ideal for
operating
in
shallow to medium water
depths.
The 20
degree
cone
angle
allows
you
to see more of the underwater world. In 15
feet
of water the 20
degree
cone
covers an area about six feet across.
The
8
degree
transducer
covers
only
about a two foot circle.
The 20
degree
transducer is
almost
always
the best to use in fresh
water,
the 8
degree mostly
in
salt water. In a
deep
water
environment,
(300
feet
-
fresh
water,
100 feet
-
salt
water)
the narrow cone
angle
is
more desirable. Since the sound
energy
is concentrated in a smaller
area,
it can
penetrate
to much
deeper depths.
17
50'
100'
150'
200'
8
Degrees
-
U
AUTO
RANGE
20
FISH ID
Lw
30
AUTO
Lw
ZOOM
FISH ID
50
EU
20
Degrees
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