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To adjust sensitivity in manual mode:
1. Turn off Auto Sensitivity from the Sonar Page by pressing
MENU|↓
to
AUTO SENSITIVITY|ENT.
2. Press ↑ to
SENSITIVITY|ENT and the Sensitivity Control Bar appears.
Press ↓ or ↑ to pick a different sensitivity setting. When it's set at the
desired level, press
EXIT.
To turn Auto Sensitivity back on:
1. From the Sonar Page, press
MENU|↓ to AUTO SENSITIVITY|ENT|EXIT.
NOTE:
To return to the original factory setting for Auto Sensitivity, see the
entry in this section on Reset Options. If sensitivity is in manual
mode, the Reset Options command will switch it back to Auto
Sensitivity when the unit is set back to the factory default settings.
Tip:
For quicker sensitivity adjustments, try leaving the Sensitivity
Control Bar on the screen as the chart scrolls. You can see the
changes on the screen as you press the up or down arrows. This is
handy when there's a lot of clutter in the water and you are
matching the sensitivity to rapidly changing water conditions.
Set Keel Offset
This unit measures water depth from the face of the transducer. Since
the transducer is installed below the water surface, the distance
displayed by the digital depth, chart depth scale, chart cursor or fish
symbols is not the exact water depth. If the transducer is 1 foot below
the surface and the screen shows the water depth as 30 feet, the actual
depth is 31 feet.
On sailboats or other large vessels with deep drafts, the distance
between the transducer installation and the keel or lower engine unit
can be several feet. In those cases, an inexact depth reading could
result in grounding or striking underwater structure. The Keel Offset
feature eliminates the need for the navigator to mentally calculate how
much water is under his keel.
Keel Offset lets you calibrate the digital depth displayed on the screen
To calibrate the digital depth, first measure the distance from the face
of the 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
digital depth perform as if it's lower in the water than it really is.