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depress the FM ENABLE pushbutton. The
correctionsw ill be incorporatedin to the systema nd
sensorsa ndt he correctl atitudea ndl ongitudew ill be
displayed on the INS UPDATE format and will also
appear on the OWN A/C MFD format.
ORIGINAL 20-50
NAVAIR 01.Fl4AAD-1
TARGET
CURSOR
Figure 20-31. DD Control Panel With GND MAP Selected
I
Figure 20-32. MFD TSD Format
20-51 ORIGINAL
NAVAIR 01-F14AAD-1
20.3.6.2.5 HUD/Designate One-Fix Update.
HUD designate one-fix update computes aircraft position,
using measurementso f azimuth and elevationf rom
the HUD centert o a designatedta rgetp oint thati s visible
through the HUD and whose coordinates are known and
stored in the waypoint tile and system altitude. This
procedure is performed only by the pilot using the cursor
control switch on the throttle to position the HUD cursor
over the visually sighted target and to designate. Like
other one-fuc update modes, it also requires that the
waypoint corresponding to the visual target coordinates
is selected for the update as described below.
1. Verify that the coordinates of the HUD visual target
are the same as those of the waypoint to be
selected for updating by calling up the appropriate
WPT DATA MFD format (Figure 20-20).
2. Call up the INS UPDATE MFD format (Figure
20-29). Select the waypoint corresponding to the
HUD visual targetv ia the increase/decreaspeu shbuttons
on the right side of the format.
3. Position the cursor over the visual target seen
through the HUD using the cursor control switch
and then depress the switch (Figure 20-33).
4. Depress the HUD pushbutton on the INS IJPDATE
MFD format. The HUD legend will become
boxed and the computed delta LAT/delta
LONG will appear as shown in Figure 20-29.
5. Ifthe deltaLAT/LONG corrections appear reasonable
and a correction is required, depress the FIX
ENABLE pushbutton on the INS UPDATE MFD
format. The corrections will be incorporated into
the systema nd sensorsa nd the correctl atitude and
lot &de will be displayed on the OWN A/C MFD
format.
20.3.6.2.6 JTIDS One-Fix Update. JTIDS one&
update uses the delta latitude and longitude information
calculated by JTlDS to perform a one-time update of the
system and sensors. This fbnction will always use the
JTIDS geodetic latitude and longitude correction data regardlesso
f JTIDS NAV MODE. This procedurer equires
JTIDS operatingin then et asa na ctivep articipant( NORM
selected on JTIDS control panel) with NET ENTR-OK.
See Chapter 19 for JTIDS operating procedures. The
JTIDS geodetic position quality must be 53 to display the
data and allow the update. This procedure can be performed
by either the pilot or RIO as follows:
1. Verify JTIDS operating and in sync.
2. Call up INS UPDATE MFD format (Figure 20-29)
available from the MENU1 MFD format.
3. Depress the JTID pushbutton on the INS UPDATE
MFD format.
If the data from JTIDS is not valid or the quality
is >3, the JTID pushbutton will be crossed out. The
JTID pushbutton boxes and the JTlDS computed
delta LAT and delta LONG will appear as shown in
Figure 20-29.
4. Ifthe delta LAT/LONG corrections appearreasonable
and a correction is required, depress the FIX
ENABLE pushbutton on the INS UPDATE MFD
format. The corrections will be incorporated into
the system and sensors and the corrected latitude
and longitude will be displayed on the OWN A/C
MFD format.
20.3.6.3 Continuous Position Updating. In addition
to one-fix position updates, the navigation system
has the capability to accept continuous navigation corrections
from external sources when they exist and are
valid. For the current configuration of the aircraft, the
only two sources available for continuous position updating
are tacan and JTIDS data. The tacan mode of
continuous updatingu ses tacanm easurementso f range
and bearing to a prestored selected waypoint that also is
an active tacan station. Thus, as in one-fix updating, it
is necessaryt o ensuret hat the selectedw aypoint corresponds
to the tacan station that is being received. The
JTIDS mode of continuous updating uses delta latitude,
longitude, and altitude calculated by JTIDS to continuouslyupdate
the navigation system. The JTIDS continuous
update will update the navigation system with either
geodetic latitude, longitude, and altitude corrections in
the GE0 mode or relative latitude, longitude, and geodetic
altitude corrections in the REL mode. When the
JTIDS altitude correction data quality is 5 10, this function
　
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