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placing the INS mode switch in the IFA position. Automatic position keeping reversion with a
hierarchy of AINS, INS, GPS and FCC air data is provided in case of an INS and/or GPS failure.
TACAN position keeping provides distance data from one of the previously stored TACAN stations.
The desired TACAN station is selected on the UFCD. See TACAN position keeping this section.
24.2.10 Position Updating. Selecting the UPDT (update) option on the MPCD top level display
provides the update sublevel display, see figure 24-10. This display allows in-flight selection of VEL
(velocity), TCN (TACAN), GPS, DSG (designate), AUTO (automatic), and MAP as the update
options. These options provide position/velocity updating to the INS/ADC during NAV or IFA modes.
All updates must be performed while in the NAV or A/G master modes, unless noted otherwise. TCN
position updating is described in the TACAN section, and VEL updating is described in A1-F18EATAC-
Series.
NOTE
The update option is not available in AINS position keeping.
A1-F18EA-NFM-000
VII-24-32 ORIGINAL
After an update is performed, the CANCEL option is displayed on the HSI UPDATE option display.
Pressing the CANCEL option cancels the previous update and removes the CANCEL option. The INS
updates the aircraft position using the last accepted position update. The CANCEL option is also
removed on touchdown or when present position is changed using the UFCD.
24.2.10.1 Designation (DSG) Update. A designation update is performed by pressing the UPDT
option on the MPCD top level display. Selecting the DSG option on the UPDT sublevel display.
Designating a waypoint/OAP with a sensor (radar, FLIR, NFLR or LDT), a HUD designation, or an
overfly designation. The DSG option may be selected before or after waypoint designation. When the
designation has been performed and DSG option selected, sensor ranging components to the target are
added to the previously entered waypoint position to give an aircraft computed position. The
difference between the computed aircraft position and the onboard aircraft position produces the
position error readout in bearing and range on the ACPT/REJ display. Selecting the ACPT option
accepts the position update and returns the MPCD top level display. Selecting the REJ option rejects
the update and returns the MPCD top display. A DSG update may be performed in the A/A master
mode if the designation was performed in A/G prior to entering A/A. The selection of UPDT/DSG
suspends auto sequential steering and disengages coupled steering.
24.2.10.2 Post-flight Update. The INS post-flight update collects terminal INS maintenance data.
The post flight update is performed using the overfly designation update method. The INS determines
the overfly designation update is a post flight update using the WonW transition. The aircraft must be
completely stopped and the parking brake engaged to prevent erroneous terminal velocity data. The
post flight update is not performed onboard ship.
The INS post flight update may be performed when the parking brake is set and the aircraft is
within 600 feet of the appropriate waypoint entered in the system (the update waypoint need not be
waypoint 0). If the waypoint position is known but not programmed in the system, the position may be
entered and used for the update. If no waypoints are available, no update should be attempted.
Figure 24-9. Position Keeping
A1-F18EA-NFM-000
VII-24-33 ORIGINAL
Figure 24-10. Position Updating Displays
A1-F18EA-NFM-000
VII-24-34 ORIGINAL
24.2.10.3 MAP Update. A MAP update is performed by selecting the UPDT option on the MPCD
top level display, designating a waypoint/OAP with a sensor (radar, FLIR or LDT), a HUD designation
or an overfly designation and selecting the MAP option on the update sublevel display. When this is
done the word SLEW appears in the upper right corner of the MPCD and the TDC is automatically
assigned to the MPCD (for map slewing). The map can now be slewed so the target on the map is under
the designation symbol (diamond). The difference between the target position and the designated
position produces the position error readout in bearing and range on the ACPT/REJ display. Selecting
the ACPT option accepts the position update and returns the MPCD top level display. Selecting the
REJ option rejects the position update and returns the MPCD top level display. The MAP option is
not available if a map is not installed.
24.2.10.4 AUTO Update. An AUTO update is performed by selecting the UPDT option on the
MPCD top level display and selecting the AUTO option on the UPDT sublevel display. When this is
done the AUTO option is boxed and the VEL, TCN, DSG and MAP options are removed. The pilot
must assign the TDC to the MPCD, overfly the waypoint/OAP and press the TDC while over the
　
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