10
Surface Clutter
S
URFACE
C
LUTTER
eliminates
most sonar returns
near the water surface
caused by trapped air, boat wakes and
temperature inversions. Most surface clutter
appears on the display because the strongest
sonar returns come from the shallowest objects.
The
L
EGEND
3000 S
ERIES
uses a sophisticated feature
called TVG (Time Variable Gain) to overcome
surface clutter and counteract the effect of
depth on sonar return strength. The level 1
setting is optimal for making sonar information
from all depths appear uniformly. Many users,
however, prefer to see more surface clutter than
this setting shows. Selecting a higher number
shows more surface clutter, but sonar returns
nearest the surface will appear more intense
than they actually are.
The
S
URFACE
C
LUTTER
setting is retained in memory
after the
L
EGEND
3000 S
ERIES
is turned off. The factory
setting is
4
.
50kHz Gain Offset (Deep Models Only)
The GAIN knob applies the same gain
increase/decrease to the 200kHz and
50kHz signal performance. This
menu allows for the gain applied to
the 50kHz beam to be adjusted higher or lower than the GAIN knob
setting to optimize it. An offset value of 5 applies the same gain to the
50kHz signal as the 200kHz gain set by the GAIN knob. Values higher
than 5 apply more gain to the 50kHz, values lower than 5 apply less
gain.
The 50kHz GAIN OFFSET setting is retained in memory after the Legend
3000/3005 Deep is turned off. The factory setting is 5.
White Line
W
HITE
L
INE
activates and
adjusts a feature which
changes how the
L
EGEND
3000 S
ERIES
draws the
bottom contour and
structure, and also
shows fainter sonar
returns more clearly.
When a
W
HITE
L
INE
setting
of 1 to 8 is selected, a
light gray band
highlights the strongest
sonar returns within the
sonar image and makes
a distinctive outline
along the bottom contour, structure and fish.
Selecting a larger numeric setting increases the
width of the band and makes fainter sonar
returns more noticeable, but the
L
EGEND
3000’
S
ability to show subtle differences in bottom
composition and structure is reduced. Selecting
a smaller numeric setting narrows the band and
shows greater variation in bottom composition.
Selecting
O
FF
turns the
W
HITE
L
INE
feature off.
The
W
HITE
L
INE
setting is retained in memory after
the
L
EGEND
3000 S
ERIES
is turned off. The factory
setting is
O
FF
.
Filter
F
ILTER
(
D
EEP
Models only)
turns the filtering
algorithms on and off.
Select
O
N
to filter excess sonar noise. Select
O
FF
to show the greatest amount of sonar
information.
The
F
ILTER
setting is retained in memory after the
3000 Deep/3005 Deep
is turned off. The factory
setting is
O
N
.
Depth Alarm
D
EPTH
A
LARM
activates a
shallow water depth
alarm. The alarm will
sound when the digital
depth becomes equal to or less than the
setting. The tone sounds at a rapid rate for
several seconds and then sounds intermittently
until the boat moves to deeper water. The
D
EPTH
A
LARM
can be muted by pressing the
C
ONTROL
P
ANEL
knob
; once muted, the alarm will not sound again
until the boat moves to water deeper than the
D
EPTH
A
LARM
setting. International models have Depth
Alarm settings in full metres from 1 m to 99m.
Note: Remember that depth is measured from the
transducer, not from the surface of the water.
The
D
EPTH
A
LARM
setting returns to factory default
after the
L
EGEND
3000 S
ERIES
is turned off. The factory
setting is
O
FF
.
USING THE LEGEND 3000 SERIES
SURFACE CLUTTER / WHITE LINE / FILTER / DEPTH ALARM / TEMP ALARM
5
5
White Line
