"Set LatlLong ASP' label. The screen shown above appears.
Now enter the exact latitude/longitude for
your position. Remember to
enter a zero at the beginning of the longitude if it's less than 100
degrees. The screen below appears after the last longitude number is
entered.
For example, lets say the bottom of the rudder on an inboard boat is
the lowest part of the boat. After measuring, you discover it's 4 feet
deeper
than the face of the transducer. Turn the Z-9500 on and press
the MENU key. Next, press
the key next to
the "More" label two times.
Now press the
key adjacent to the "Keel Offset" label. Finally, press
the
key adjacent to the
"Neg. Keel Offset" label. A menu appears
over
the sonar screen that says "Enter Keel Offset 0.0" as shown below.
If you're east of Greenwich, England (east longitude), press the key
adjacent to the "East/West" label. Otherwise, if everything on the
screen is correct, press the key adjacent to the "Use Position" label.
The Z-9500
will return to the last used loran screen, using a position
offset based on the latitude/longitude you entered.
ASF
N
U
Exact Pos
32° 00.45'
83° 11.33'
• East/West Long.
__Use Position
I
I
Since the deepest part of the boat in our example
is four feet deeper
than the transducer's face, press
the
key adjacent to the 4 label, then
the
key next to the 0 label. The number "-4.0" appears in the Enter
Keel Off. window. Now press the key adjacent
to the ENTER label.
The Z-9500 will automatically compensate
for the four foot difference
and display the digital bottom depth as if the transducer was four feet
deeper than it actually is. For example, if the Z-9500
displayed
the
water depth as 10 feet before changing the keel offset, afterwards it
would read six feet. This is the actual distance from the
deepest part
of
our
example boat to the bottom.
Positive Keel Offset
The transducer must be installed below the surface of the water to
guarantee ft will be in contact with the water at all times and boat
speeds. No sonar system will operate with the transducer in air.
Therefore, most sonar systems do not show the water's
depth
from the
surface to the
bottom, but from the transducer's face to the bottom.
96 41
N ——°——,
u———0——' a
C
C I'ot4
Enter Exact
Lat/Long
Position
Clear Enter
Offset
Keel
liD
bic
1ear IEnterh
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