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83
feet, if the transducer is
mounted three feet below the
surface.) The difference be-
tween the depth sounder’s
reading (47 feet) and the ac-
tual water depth (50 feet) is
called the keel offset. In this
example, to make the digital
sonar read the correct depth,
you would use a
positive
keel
offset of three feet.
Another time you may wish to change the keel offset is if you want to know
the bottom depth from the deepest part of the boat. For example, by
carefully measurement you find that the deepest par of the boat is four feet
below the transducer’s face. By setting a
negative
keel offset of four feet,
the sonar unit will show the bottom depth from the lowest part of the boat
to the bottom.
IMPORTANT!
The digital depth display is the only display that is affected by the keel offset
feature! The chart always shows the distance from the transducer’s face.
To adjust the keel offset, press the MENU key repeatedly until the Keel
Offset menu appears as shown above. Now press the key next to that
menu until the check mark is on the desired box. “+” is for a positive keel
offset, “-” for a negative one. When the check mark is on the desired box,
enter the keel offset using the numbered keys, then press the ENT key.
Press the CLR key to return to the sonar screen. Remember, the digital
sonar display shows the keel offset, not the chart. Also, the depth alarms
will use the keel offset, so remember this when setting a shallow or deep
alarm.
SONAR PRESET
To return only the sonar settings to their factory defaults, use the Sonar
Preset feature. The defaults are as follows:
Automatic: ....................................................................... On
Fish ID: ............................................................................ Off
FishTrack: ....................................................................... On
Digital Sonar: ................................................................... On
Zoom: .............................................................................. Off
Alarms: All Alarms ........................................................... Off
Shallow Depth Alarm Setting:.................................... 10 Feet
Deep Depth Alarm Setting:........................................ 100 Feet