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Normal Operation
NOTE: If a message such as
that shown in Figure 20 is
displayed, it may be that the
system has not had time to
acquire a signal or has
acquired a signal and not yet
received all the data for a
NEXRAD image. If this mes-
sage is still present after a
few minutes, refer to the
Messages section of this
addendum.
Figure 20
Always make note of the age
of the data displayed in the
bottom
right
corner.
Remember, the older the age
the more suspect the accu-
racy of the data. The colored
bar will be green the first
50% of the expiration time
period for the displayed data
then turn yellow.
Also,
delays occurring prior to the
weather distributor time
stamping the data are not
reflected in the displayed
age. These delays can range
Figure 21
from one to seven minutes.
If no data update has been received for 75 minutes the NEXRAD image
is discarded and no longer displayed.
2. Press the RNG /RNG
Key to zoom in on the display. The map is
centered on the present position indicated by the symbolic aircraft.
3. To view a specific area of weather, move the joystick in the desired
direction. A pointer will appear on the display connected to the symbolic
aircraft with a flashing line (see Figure 21). The distance and bearing
between present position and the pointer is shown at the bottom center
of the display. As the joystick is held the pointer will continue to move.
When the pointer reaches the edge of the display the map will pan to
keep up with pointer movement. Release the joystick to stop moving the
pointer. Press the RNG /RNG
keys to zoom in or out on the pointer
position.
24
Revision 2 Nov/2002
KMD 550/850 FIS Addendum
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