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When turned on for the first
time,
the UItraNavGPS automatically places
the bottom signal in the lower half of the screen. This is called Auto
Ranging
and is part of the automatic function. The range cannot be
changed manually while the unit is in automatic.
RANGE
- Manual
The UltraNavGPS
gives you
control overthe
rangewhen
it's
in
the
manual
mode. Both the lower and the upper
limit are adjustable.
To
changethe range, first make certain the UItraNavGPS is in the manual
mode. If
necessary, press the AUTO
key
to switch to the manual mode.
Next,
press
the RANGE key. Two arrows appear
in the
lower left corner
of the display. These are the range adjust arrows. Press the key
corresponding to the upper or lower arrow to decrease or increase the
range.
The available ranges are 0-1
0,20,40,60,100,150,200,300,500,
900 feet. After the desired range
is displayed, press
the
CLEAR key
to
erase the
range
arrows.
MANUAL
RANGE
ADJUSTMENT
MENU
NOTE: The
depth capability of the UltraNavGPS depends
on the trans-
ducer installation, water and bottom conditions, and other factors. You
can expect
to read depths in excess of 350 feet in both fresh and salt
water.
the channel number. Azimuth is the direction of the satellite from
your
present
location. Elevation is the
height of the satellite above the horizon.
SIG is the signal-to-noise ratio. The
higher
the
SNR,
the better. Channel
status has three
possible modes: Idle
(-), Searching(S),
or
Tracking (1). If
the channel is not
using
a
satellite,
then it is idle and dashed lines
appear in
the displays
for that channel. If it is searching for the
satellite, the (S)
appears. Once it's locked on to the satellite, then the
(T) appears. The
example
screen on the
previous page
has channels 1,2, and
4
tracking, 3
is
searching,
and 5 is idle.
Beneath the Satellite Info
display
is the list of satellites that are
visable from
your location. They
are listed by their satellite number.
To exit from the satellite info
screen, press the CLEAR
key.
ENGINEERING SCREEN
The UltraNavGPS lets
you view the Dilution of Precision for the
horizontal
(HDOP), geometric (GDOP), vertical
(VDOP), position (PDOP), and time
(TDOP). These are
displayed on the Engineering Screen.
To view this
screen, press
the MENU key
three
times. Now
press
the
key
adjacent to the "ENG SCREEN" label. The screen shown below appears.
GDOP stands for Geometric Dilution Of Pre-
cision. This is a
crossing angle indicator. It
shows the combination value of horizontal
(HDOP), vertical
(VDOP), and Time
(TDOP).
The smaller the GDOP number is, the better
the
crossing angles
are. The GPS receiver
selects satellites based
on
GDOP,
therefore it
always
tries to use satellites that will result in
good crossing angles. The best
way to use
GDOP is to anticipate system problems. In
other words, if the crossing angles are de-
creasing, then the satellites could be moving
out of your viewing range. Therefore, the ______________________
system may
become unusable if more satel-
lites don't appear shortly.
Above the GOOP display is the HDOP display. This shows the 2D,
horizontal crossing angle. Again,
the smaller the number
is,
the better
the
crossing angles
are.
Typically, 1-4 is
good, 5-10 is
fair, and anything over
10 is
poor
for all
displays
on this
page. The UTC OFFSET is the difference
between your local time and UTC (GMT).
12 61
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j33FT 0
r
flDJUST
R'HOEi
HOOP 2.37
GOOP 3.83
'JooP 2.41 PooP 3.38
TOOP 1.79
UTC OFFSET

05:00

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