Garmin echo 100 series - Adjusting the Range of the Depth Scane; Sonar Frequencies; Selecting a Frequency; Adjusting the Zoom

NOTE:
To
receive
DownVu
scanning
sonar,
you
need
a
compatible
chartplotter
or
fishfinder
and
a
compatible
transducer.
DownVO
high-frequency
sonar
provides
a
clearer
picture
below
the
boat,
providing
a
more
detailed
representation
of
structures
the
boat
is
passing
over.
Traditional
transducers
emit
a
conical
beam.
The
DownVO
scanning
sonar
technology
emits
a
narrow
beam,
similar
to
the
shape
of
the
beam
in
a
copying
machine.
This
beam
provides
a
clearer,
picture-like
image
of
what
is
beneath
the
boat.
Sonar
Frequencies
NOTE:
The
frequencies
available
depend
on
the
transducer
being
used.
Adjusting
the
frequency
helps
adapt
the
sonar
for
your
particular
goals
and
the
present
depth
of
the
water.
Higher
frequencies
use
narrow
beam
widths,
and
are
better
for
high-speed
operation
and
rough
sea
conditions.
Bottom
definition
and
thermocline
definition
can
be
better
when
using
a
higher
frequency.
Lower
frequencies
use
wider
beam
widths,
which
cover
a
larger
area
and
can
let
the
fisherman
see
more
targets,
but
could
also
generate
more
surface
noise
and
reduce
bottom
signal
continuity
during
rough
sea
conditions.
Wider
beam
widths
generate
larger
arches
for
fish
target
returns,
making
them
ideal
for
locating
fish.
Wider
beam
widths
also
perform
better
in
deep
water,
because
the
lower
frequency
has
better
deep
water
penetration.
They
can
be
used
to
search
for
structures
such
as
brush
piles.
Selecting
a
Frequency
1
Select
MENU.
2
Select
Frequency
or
FREQ.
3
Select
a
frequency.
Adjusting
the
Range
of
the
Depth
Scale
You
can
adjust
the
range
of
the
depth
scale
that
appears
on
the
right
side
of
the
screen.
Automatic
ranging
keeps
the
bottom
within
the
lower
third
of
the
sonar
screen,
and
can
be
useful
for
tracking
the
bottom
where
there
are
slow
or
moderate
terrain
changes.
When
the
depth
changes
dramatically,
like
a
drop
off
or
cliff,
manually
adjusting
the
range
allows
a
view
of
a
specified
depth
range.
The
bottom
is
shown
on
the
screen
as
long
as
the
bottom
is
anywhere
within
the
manual
range
established.
1
Select
MENU
>
Range.
2
Select
an
option.
•
To
allow
the
device
to
adjust
the
range
automatically
based
on
the
depth,
select
Auto.
•
To
increase
or
decrease
the
range
manually,
select
Manual,
and
select
..._or,....-.
NOTE:
Setting
the
range
on
one
page
applies
that
setting
to
all
pages.
Adjusting
the
Zoom
You
can
adjust
the
zoom
manually
by
specifying
the
span
and
a
fixed
starting
depth.
For
example,
when
the
depth
is
15
meters
and
a
starting
depth
of
5
meters,
the
device
displays
a
magnified
area
from
5
meters
deep
to
20
meters
deep.
You
also
can
allow
the
device
to
adjust
the
zoom
automatically
by
specifying
a
span.
The
device
calculates
the
zoom
area
from
the
bottom
of
the
water.
For
example,
if
you
select
a
span
of
10
meters,
the
device
displays
an
magnified
area
from
the
bottom
of
the
water
to
10
meters
above
the
bottom.
1
Select
MENU
>
Zoom.
2
Select
Manual
or
Auto.
3
Select
Span
and
select..._
or,....-
to
increase
or
decrease
the
magnification
of
the
magnified
area.
4
If
necessary,
select
Depth
to
adjust
the
zoomed
window
up
or
down.
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Sonar
3