System Operation
3-110
GNS-XLS Flight Management System
Rev. 8
Apr/00
DEAD RECKONING (DR) TO PRIMARY NAVIGATION MODE -
VLF (RPU) ONLY EQUIPPED
NOTE: System automatically reverts to the Primary Navigation
Mode 30 seconds after the NAV RDY-VERIFY POSITION message
appears. VERIFY POSITION message and the MSG light remains
on. To verify position use Position Check and Update Procedure.
NAV RDY - VERIFY POSITION message only appears on the SYS-
TEM MESSAGES Page following a system DR.
POSITION CHECK AND UPDATE PROCEDURES
Using a Sensor
A position update may also be performed using any one of the navi-
gating interfaced position sensors as a reference. The following pro-
cedure describes this action:
1. HOLD Key -DEPRESS.
2. Line Select Key -
DEPRESS ONCE to
place the cursor over the
FIX field. The field will dis-
play FIX? (Figure 3-177)
3. BACK Key - DEPRESS
until the desired sensor
(preferably the GPS sen-
sor) to be used as the
update reference appears
in the cursor. The position
of each sensor will appear
sequentially along with the
DIF to the composite posi-
tion. (Figure 3-178)
4. ENTER Key - DEPRESS.
The cursor will advance to
the DIF field displaying the
direction and distance in
degrees, minutes, and
hundredths of minutes
from the sensor position
to the composite position.
5. ENTER Key - DEPRESS to update composite position to the select-
ed sensor. NAV Page 1 will be displayed.
POS N 40 59.80
W096 17.00
IDENT ----
FIX ? N 40 59.80
W096 17.00
DIF S 0.00
E 0.00
POSITION FIX
>
>
<
Figure 3-177
POS N 40 59.80
W096 17.00
IDENT ----
GPS ? N 40 59.70
W096 17.20
DIF N 0.10
E 0.20
POSITION FIX
>
>
<
Figure 3-178
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