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will display and use only the latitude and longitude
corrections.
Selection of JTIDS continuous position updating is
made via the MFD NAV SYSTEM AID format (Figure
20-34) that will appear when the NAV pushbutton is
depressedo n the MFD HSD or OWN A/C format. The
remaining procedures for JTIDS continuous update are
the same as JTIDS one-fix update. Depress the JTID
pushbutton on the NAV SYSTEM AID-JTID format. If
the data from JTIDS is not valid or the quality is >3, the
JTID pushbutton will be crossed out. The J’TID pushbutton
boxes and the JTIDS computed delta LAT, LONG,
and ALT will appear as shown in Figure 20-34. Dcpression
ofthe ENABLE pushbutton on the top center of the
ORIGINAL 20-52
NAVAIR Ol-F14AAD-1
* 360 * - -
‘./* :
5L- --A5
94
TWSA COOL
I
IOL - _ _ - 110
Figure 20-33. HUD/Designate Position Update
NAV SYSTEM AID format now allows the corrections,
which are continuously computed, to update the system.
Selection ofcontinuous position updating is made via
the MFD NAV SYSTEM AID format (Figure 20-34)
that will appear when the NAV pushbutton is depressed
on the MFD HSD or OWN A/C format. If tacan data is
being received from a transmitting station, the TCN
legend will not be crossed out. The procedure for tacan
operation is the same as for one-fix tacanposition update
described in paragraph 20.3.6.2.2. Select the correct
waypoint using the up or down arrows on the HSD
format, then depress the NAV pushbutton. Once this is
done, depressing the TCN pushbutton on the resulting
NAV SYSTEM AID format boxes the TCN legend and
computed corrections for latitude and longitude are then
displayed. Depression of the ENABLE pushbutton on
the top center of the NAV SYSTEM AID format now
allows the corrections, which are being continuously
computed, to be provided to the system.
Note
For continuous position updating neither the
INS nor the SAHRS are updated. Once this
aiding mode is deselected or becomes
invalid, the computed corrections will not be
provided and a change in position may occur.
20.3.6.4 Surface Waypoint Position Determination.
The position of a surface waypoint is determined
by measuring its location with respect to the aircraft
or with respect to some other known point. The
following sensors and procedures can be used: visual,
Wan, radar, HUD/designate, DEU, and TID. Selection
is made from the SURFACE WPT POS format on the
MFD. The computed latitude and longitude are displayed
on the MFD or DD. The SURFACE WPT POS
format is called by selecting the SWP pushbutton on the
INS UPDATE format.
Note
The INS UPDATE format is called by selecting
the UPDT legend on any of the HSD
MFD formats.
On the SURFACE WPT POS MFD format (Figure
20-35), an “X” over the legend for a position determination
mode indicates that the mode is not available.
Until one of the available modes is selected, the format
shown in Figure 20-35 displays only the mode legends,
the boxed SWP legend, and the SURFACE WPT POS
header.
20-53 ORIGINAL
NAVAIR 0%Fl4AAD-1
NAV SYSTEM AID - TACAN
NAV SYSTEM AID - TCN
b.LoNG-W 1.42
NAV SYSTEM AID - JTIDS
NAV SYSTEM AID - JTIDS
d. LAT - N oo”ol.3c
ALONG - w dol.42
fAT)l-F5OD431-0
Figure 20-34. Navigation System Continuous Update MFD Format
ORIGINAL 20-H
NAVAIR Ol-Fl4AAD-1
SURFACE WPT POSLAT
- N 40*45.00
LONG - w 7C3I .53
SURFACE WPT POSFigure
20-35. Surface Waypoint Position MFD Formats (Sheet 1 of 2)
20-55
NAVAIR Ol-F14AAD-1
SURFACE WPT POSSURFACE
WPT POSUT
- N 40~45.00
LONG - W74~31.00
RN0 ia.
BRG - 330*
Figure 20-35. Surface Waypoint Position MFD Formats (Sheet 2 of 2)
ORIGINAL 20-56
NAVAIR 01.Fl4AAD-1
When using the visual, radar, or HUD/designate procedure,
after the surface waypoint latitude and longitude
have been computed and displayed on the MFD, pressing
the ENTER pushbutton on the MFD format enters
the coordinates into the waypoint tile in an assigned
waypoint number. For the DEU method, the coordinates
are also displayed on the MFD, but are entered by pressing
the DEU ENTER pushtile. When using the TID
method, pressing the sensor hand control tiigger enters
the coordinates that are displayed on the MFD.
The paragraphs that follow describe the various
methods and provide procedures.
20.3.6.4.1 Visual Mode. For a visual waypoint position
determination, the aircraft present-position coordinates
are assigned to the waypoint position at the
　
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