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arrow key. The unit will revert to the sonar display with the fish alarm
turned on. Repeat the above steps to turn the fish alarm off.
Note: If the unit is in the manual mode, turning the Fish Alarm on will also
turn the automatic mode and Fish ID on, also.
Keel Offset
Normally, this unit measures water depth from the face of the transducer.
Since the transducer is below the surface of the water, this distance is not
the exact water depth. If the transducer is one foot below the surface, and
the screen shows the water depth as 30 feet, then the depth is actually 31
feet.
You can calibrate the depth reading using the keel offset feature. First,
highlight the "SET KEEL OFFSET" label on the
"System Setup" menu, then press the right arrow
key. The screen shown at right appears. The cur-
rent bottom depth shows in the upper left corner
of the screen. The keel offset shows beneath it.
In this example, we need to change the keel off-
set so that the unit will add one foot to the depth,
since the transducer is one foot below the sur-
face. Press the right arrow key, then the up or
down arrow keys until +1.0 appears in the box,
as shown at right, then press the ENT key. This immediately changes the
digital depth display at the top of the screen by one foot. Press the EXIT
key to erase this menu.
Note: Another way to use the keel offset feature is if you want to know the
depth of the water below the lowest part of the boat, instead of the sur-
face. To do this, measure the lowest part of the boat below the transducer.
In this example, we'll use 3 feet. Now, using the keel offset feature, adjust
the offset for a negative 3 feet.
Please note that adjusting the keel offset only affects the digital depth
display and all features that use the digital depth, such as the depth alarms
and FishTrack. This doesn't affect the chart at all.
Calibrate Speed
You can calibrate the speed display if an optional speed sensor is at-
tached. To do this, highlight the "Calibrate Speed" label on the "System
Setup" menu, then press the right arrow key. A screen similar to the one at
the top of the next page appears.
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