ADJUST KE EL OFFSET
CALIBRAT

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MENU - PAGE 6 ______________________
ADJUST
KEEL OFFSET
The keel offset
feature lets you ____ _____
compensateforthetransducers
location. Since this sonar unit _________
measures the water
depth from
the face of the
transducer,
there
can be a significant difference ______
between the
actual w:flpth PAGc
6 MORE
unit. For
example, suppose you
mount a bolt-thru-hull transducer on the bottom of the boat. When you
launch the boat
you
find
that this location places
the
transducer three feet
belowthe surface of
thewater.
Therefore,
the
depth.sounderalways reads
three feet shallower than the actual water
depth. (In other
words, if the
bottom is 50 feet
deep,
the
depth sounderwill read
47feet,
ifthetransducer
is mourfted three feet below the
surface.) The difference between the
depth sounder's
reading (47 feet)
and the actual
water
depth (50 feet)
is
called the keel offset. In this example you will use a positive
keel offset.
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.
Forexample, by
careful
measurmentyou
find
thatthe
deepest part
of the boat is
fourfeet below the
face of the transducer. By setting a negative
keel offset of four
feet,,
the
sonar unit will show
the bottom
depth from the lowest
part
of the boatto the
bottom.
IMPORTANT!
The
digital depth display is
the
only
sonarthat is affected by
the keel offset
feature. The chart will always show the distance from the face of the
transducer.
To adjust
the keel offset, first
press the MENU key 6 times
while a sonar screen is dis-
played. Now
press
the
key next
to the "ADJUST KEEL OFF-
SET" label. The screen shown
below appears.
The
digital depth displays
in the
upper
left corner of
the screen.
The keel offset in use
shows in
I
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FEET I
2.2. S O.O
GETTING STARTED
Initialization - Power On
In order
for the UltraNav
II
to lock onto the
satellites, it must first find them.
If
you simplytum
the unit on and
wait,
the unit will find the satellites
by
itself
in 15
minutes orless. This
is
called "Cold Start." If
you
let itfindthe
satellites,
the time
display will probably be
wrong, since it will be showing UTC
time
orthe time at
Greenwich, England. However,
all other
navigation
displays,
including the
position display will be
correct. (You
can set the time to
your
local time.)
To
speed up
the satellite
acquisition process, you
can initialize
the UltraNav II or "tell it where it is" the first time it's turned on. This
initialization process is
usually done only
once and requires
the
following
The unit
usually only
takes a few minutes or less to find the satellites once
it's been initialized by
the user.
Afterthe
powercable and GPS antenna module are installed, press the ON
key, then press the GPS
key. Next, press the MENU key. Now press
the
key
next to the "CHANGE GPS SETTINGS" label.
Finally, press
the
key
next tG the "SET
LAT, LON, ALT, TIME, DATE" label. The screen shown
below
appears next.
This is the GPS setup screen.
The settings now in use are
shown atthe top
of the
display.
If you're using the unit for the
first time, these settings are
probably
wrong for your posi-
tion and time. To
change any
of
the numbers on this display,
simply pressthe key nexttothe
arrow with the desired label.
For example, to change the
local
time,
press
the
key
nextto
the "CHANGE TIME' label.
LATITUDE N 36°08.8E2'
LONGITUDE W 9S0SO.4S4
ALTITUDE 1696
TIME 10:17:23 PM
DATE 1'03'1993

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LA - ..
I CHANGE ALT
NETI1
rtEDATE
Note: If
you don't use the "cold stan'
feature, then
you
will have to change
all of the
settings
on this
page to their
correct values. In other
words, you
can't
simply
enter
your present position and have the unit find the correct
values
by itself.
data:
1. Present
position in latitude/longitude
2. Elevation above sea level (altitude)
3. Today's date and time
USE NUMBERED KEYS TO
ENTER KEEL OFFSET.
USE UP DOWN CURSORS
FOR PLUS OR MINUS.
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