3. Pressure altitude (PRS) to the
nearest 100 feet.
4. Density altitude (DEN) to the
nearest 100 feet.
bc. The Setup Pages.
(1) The Setup 0 Page. The SET 0 page is
used for computer updating of the database. Update
information is sent on 3.5 inch disks. A computer is
used via the data loader jack installed in the
instrument panel. This is normally a maintenance
The KLN 90B does not perform any
navigation functions while the database is
The disks can only be used to update one
KLN 90B, although they can be used to
update a specific unit numerous times.
The first time the disks are used in an
update operation, a unique identification
code from the KLN 90B being used is
uploaded to the disks. These disks may be
used in this specific KLN 90B an unlimited
number of times that could be required if
switching between the North American and
International databases occurs during one
update cycle. These disk s, however, may
not be used to update other KLN 90B's.
compensated for their NavData.
(2) The Setup 1 Page. The Setup 1 page is
used to manually update the position of the KLN 90B
and enter a groundspeed for use of the KLN 90B in the
take home mode. Refer to Figure 3-80. Since the
KLN 90B stores its position and other required
parameters in memory when power to the unit is
removed, it is seldom necessary to aid the unit in
reaching a NAV ready status. In order for the unit to
reach a NAV ready condition, it is necessary to meet
the same conditions outlined in the Initialization,
N 37o 39.00
W 97o 25.97
0 KT 308o
Figure 3-80. Setup 1 Page
(a) The KLN 90B's almanac data must
be current. Almanac data is crude orbital information
for all the satellites and is used for initial acquisition
when the unit is first turned on. This data is stored in
the KLN 90B's nonvolatile memory and is considered
current up to 6 months. Each satellite sends almanac
data for all satellites. Since the KLN 90B routinely
updates the almanac data during normal operation, the
almanac data will become out of date only if the KLN
90B hasn't been used for the previous 6 months or
longer. Collecting new almanac data takes place
automatically if the data is more than 6 months old.
This will usually take about 6 minutes, but no more
than 12 minutes.
(b) The aircraft must be located so the
GPS antenna has an unobstructed view of the sky.
(c) It is very helpful for the KLN 90B to
have the correct date, time, and position. This
information is stored in the battery-backed memory of
the KLN 90B, so it is not normally required to update it.
If acquisition time is not important, it is not necessary
to update the date, time, and position.
1. Select the Setup 1 page by turning
the left outer knob to SETUP,
annunciated in the lower left
segment of the display. Next, turn
the left inner knob until the SET 1
page is selected.
2. Press the left CRSR button to bring
the cursor on the page over the
longitude of the present position can be
entered directly instead of entering a