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acronym as shown in Figure 20-29. Since all updates
except JTIDS use the coordinates of a selected prestored
waypoint, the coordinates of the selected waypoint
should be verified prior to performing all updates except
JTIDS. This is done by calling up the WPT DATA 1 or
2 MFD format containing the point as shown in Figure
20-20 that is available from the OWN A/C basic format.
The procedures for each of the types of updates are
provided below.
20.3.6.2.1 Visual One-Fix Update. Visual onefix
update computes the aircraft’s position using the
coordinates of a point selected and stored in waypoint
file and substituted for the aircraft’s position at the instant
of direct flyover. This requires that entry, selection,
and verification of the waypoint be made prior to flying
over the point and that the VIS pushbutton on the INS
UPDATE MFD format be depressed at the time of
flyover. When this is done, the INS UPDATE FORMAT
shall display the computed latitude and longitude differences
for evaluation. The procedure can be performed
by either pilot or RIO as follows:
1. Verifythecoordinatesofthewaypointtobeoverflown
by calling up the appropriateW PT DATA MFD format
(Figure 20-20). If incorrect, enter the correct
coordinatesfo r the point via the DEU or the DD.
2. Call up the INS UPDATE MFD format, Figure
20-29:Select the correct waypoint corresponding
to coordinates of the visual update point via the
increase/decreaspeu shbuttonso n the right side of
the INS UPDATE MFD format.
3 At the instant of direct flyover of the visual point
depress the VIS pushbutton. The VIS legend will
be boxed at this time, and delta LAT and delta
LONG will appear as shown in Figure 20-29. Optimum
results will be obtained with low and slow
flight conditions.
4. Verify that the delta LAT/LONG corrections are
reasonable.
NAVAIR WI-Ff4AAD-1
5. Ifthe delta LATlLONG corrections appear reasonable
and a correction is required, press the FIX
ENABLE pushbutton on the INS UPDATE MFD
format. The corrections will be incorporated into
the system and sensors and the correct latitude and
longitude will be displayed on the OWN A/C MFD
format.
20.3.6.2.2 Tacan One-Fix Update. Tacan one-fix
update computes aircraft position using tacan measurements
of range and bearing from a tacan station whose
coordinates are known and stored in the waypoint tile.
The procedure requires that the tacan be operating and
the station selected correspond to the waypoint that will
be called up and whose coordinates will be used in the
updating process. The procedure can be performed by
either the pilot or RIO as follows:
1. With the tacan operating, select a tacan channel
whose latitude and longitude coordinates correspondt
o the referencedt acanl ocation storedi n the
waypoint tile.
2. Verify that the coordinates of the tacan station
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. If incorrect,
enter the correct values via the DEU or
DD.
3. Call up the INS UPDATE format, Figure 20-29.
Select the correct waypoint corresponding to the
coordinates of the tacan station using the increase/
decreasep ushbuttonso n the right sideo f the INS
UPDATE MFD format.
4. Depress the TCN pushbutton. The legend will be
boxed and the computed delta LAT and delta
LONG will appear, as shown in Figure 20-29.
5. Verify that the delta LAT/LONG corrections are
reasonable.
6. IfthedeltaLAT/LONG correctionsappearreasonable
and a correction is required,d epresst he FIX
ENABLE pushtile on the INS UPDATE MFD format.
The corrections will be incorporated into the
system and sensors, and the correct latitude and
longitude will be displayed on the OWN A/C MFD
format.
20-45 ORIGINAL
NAVAIR Cd-FlUADINS
UPDATE-VIS
PLAT -N 2-15.31
ALONG- w I* a.42
Figure2 0-29.I NS UPDATEh @D Formats( Shee1t of 4)
ORIGINAL 2046
INS UPDATE -TCN
ALAT - N 20 15.31
ALONG-W 1’ 8.42
INS UPDATE- RDR
ALAT -N 2~15.31
ALONG - W ,* 8.42
Figure 20-29. INS UPDATE MFD Formats (Sheet 2 of 4)
ORIGINAL
NAVAIR OSF14AAD-1
INS UPDATE-HUD
ALAT - N 2’15.31
ALONG-w I* 8.42
INS UPDATE-D/L
ALAT - N 20 15.31
ALONG-w ID 8.42
Figure 20-29. INS UPDATE MFD Formats (Sheet 3 of 4)
ORIGINAL 20-48
L
INS UPDATE - JTID
A UT - N 02: 16.31
(AT)O-F50D-4343O-;r
Figure 20-29. INS UPDATE h@D Formats (Sheet 4 of 4)
/
I $1 3
　
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