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The satellite status page shows the ID numbers for
the satellites and the relative signal strength of
each satellite received. Turn the K knob to view
additional satellites.
TAKEOFF TOUR
Acquiring Satellites
‘Search Sky’ indicates that satellite almanac data
is not available or has expired (if the unit hasn’t
been used for six months or more). The data will
be recollected from the first available satellite.
Once the database has been acknowledged, the satellite status page will appear,
and the GNC 250XL will begin to collect satellite information. An ‘Acquiring’ status
will be displayed on the satellite status page, and the signal values on the bottom line
of the page will begin displaying numeric values. This is a good indication that you
are receiving signals and satellite lock will occur. Following the first-time use of your
GNC 250XL, the time required for a position fix will vary — usually from two to five
minutes.
If the unit can only obtain enough satellites for 2D navigation (no altitude), the
unit will use the altitude provided by your altitude encoder (if one is connected and
working). If not, you will be prompted to enter the altitude with a ‘Need alt- Press
NAV’ message. If this message occurs, press the
N
key and use the
K
and
O
knobs to enter the altitude shown on your altimeter. Press
E
when finished.
If the GNC 250XL has not been operated for a period of six months or more, it
may have to ‘Search the Sky’ to collect new data. This means the unit is acquiring
satellite data to establish almanac and satellite orbit information, which can take 5 to
10 minutes. The satellite status page will display a ‘Search Sky’ status, and the
message annunciator (
U
), next to the
M
key, will also flash to alert you of a system
message — ‘Searching the Sky’.
To view a system message
:
1. Press
M
.
The message page will appear and display the status or warning information
applicable to the receiver’s current operating condition.
To return to the previous page after viewing a message
:
1. Press
M
again.
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250xl manual 2 7/17/98 1:26 PM Page 2