18
Transducer Level (L) and
Keel / Depth Offset
On installation the depth displayed is from the transducer.
Normally the transducer is mounted at some distance above
the bottom of the keel. If this distance is entered as a
positive (+) number, (Keel Offset) the display will show
the depth below the keel. The transducer is also mounted
below the water line. If this distance is entered as a
negative (-) number, (Depth Offset) the display will show
depth from the waterline.
The iScan 180 also includes an adjustments to compensate
for some transducer installation problems, especially thru-
hull installations, where the transducer’s stem is not
perfectly vertical to the water’s surface. This problem can
be caused by improper installation, or by changes in the
boats fore/aft weight.
When the boat is over a known level bottom, the forward
vertical (VERT) scan display should show a level line. If
the bottom display is slanted upward or downward (as in the
pictures at left), note the approximate angle of the
unwanted upward or downward slope on the display. Then
proceed to the TRANSDUCER adjustment menu, as
above, and press the
softkey buttons to adjust the
Level (L). It is possible to adjust +/- 15 degrees. Positive
numbers will tend to make the bottom slope upwards and
negative numbers will make the bottom slope downwards.
After making the adjustment, go to the forward vertical
display and verify the correction. Once adjusted, the iScan
180’s memory will retain the setting.
Demo
If the DEMO softkey is pressed the iScan 180 will go into
a demonstration mode where simulated data is sent to the
display. This mode can be a useful tool to help understand
the operation of the unit. To exit the DEMO mode, press
the DEMO softkey again.
System Reset
The iScan 180 remembers most setting when it is turned
off. Normally this is good, however sometimes it can cause
problems and you may want to do a reset on the machine to
restore it to the factory defaults. To do this, turn the unit on
while simultaneously pressing both the CURSR and PWR
buttons.
L= 3.1 Ft
K= +10
K = 0.0
L = 0
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