Lowrance LCX-20C, Operation Instructions Manual

Page: 85 / 200

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transducer to the lowest part of the boat. In this example, we will use 3.5
feet. This will entered as a
negative 3.5 feet, which makes the depth
indicators perform as if the transducer's lower in the water than it really
is.
1. Press
MENU
|
MENU
|
↓
to
S
ONAR
S
ETUP
|
ENT.
2. Use
↓
to scroll down to
K
EEL
O
FFSET
, then press
ENT.
The Keel Offset
dialog box appears. Press
↓
to change the plus (+) sign to a minus (–)
sign.
3. Press
→
to the first number, then press
↑
to change the number to 3
4. Press
→
to the second number, then press
↑
to change the number to
5, then press
EXIT
. The depth indicators now accurately show the water
depth beneath the keel.
NOTE:
If knowing the exact depth of water beneath the keel is less
important, you can calibrate the depth indicators so that they show
the actual water depth from surface to bottom. To do this, first
measure the distance from the face of the transducer to the surface
(the water line on the boat). In this example, we will use 1.5 feet. This
will be entered as a
positive 1.5 feet, which makes the depth
indicators perform as if the transducer's higher in the water than it
really is.
1. Press
MENU
|
MENU
|
↓
to
S
ONAR SETUP
|
ENT
|
ENT
.
2. The Keel Offset dialog box appears with a plus (+) sign at the
front of the box.
3. Press
→
to the first number, then press
↑
to change the number
to 1.
4. Press
→
to the second number, press
↑
to change the number to
5, then press
EXIT
. The depth indicator now accurately shows the
water depth from surface to bottom.
Sensitivity & Auto Sensitivity
The sensitivity controls the ability of the unit to pick up echoes.
Sensitivity can be adjusted, because water conditions vary greatly. A
low sensitivity level (from zero to 50 percent) excludes much of the
bottom information, fish signals, and other target information.
High sensitivity levels let you see this detail, but it can also clutter the
screen with many undesired signals. Typically, the best sensitivity level
shows a good solid bottom signal with some surface clutter.