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provides the following changes on the HUD: a target diamond appears below the heading scale to
provide target heading information, another target diamond also appears indicating the target line of
sight (LOS) and the WYPT data (range) on the lower right corner is replaced with TGT data. HUD
target steering operates the same as described for waypoint/OAP great circle steering.
24.2.13.1 NAVDSG (Navigation) Designation. Selecting the NAVDSG option designates the waypoint
as a target. The changes mentioned above appear at designation, see figure 24-14.
To NAVDSG an OAP the procedure is slightly different. When the NAVDSG option is selected the
OAP is designated and all data for the designated target on the MPCD and HUD operate the same as
described above, except that the NAVDSG legend is replaced with the O/S option and the OAP option
is boxed. The O/S option must now be selected to add the offset data to the OAP position and complete
the designation. Another method of adding the offset data to the OAP position (completing the
designation) is to assign the TDC to the MPCD and actuate the TDC. When this occurs, the O/S legend
is removed, the boxed OAP legend is replaced with a boxed TGT legend, the offset symbol is replaced
with the target diamond and the designated aimpoint reverts to the aimpoint symbol. A NAVDSG
cannot be performed if a waypoint/OAP is already designated.
24.2.13.2 Overfly Designation. An overfly designation is performed on a waypoint/OAP by pressing
the TDC while it is assigned to the MPCD and the aircraft is overflying the waypoint/OAP. When this
happens the MC assumes that the aircraft is over the waypoint/OAP and the aircraft position at that
time is designated as the waypoint/OAP position. In the case of an OAP the offset data is automatically
added to the aircraft present position to complete the designation. When an overfly designation is
performed the changes mentioned above occur, see figure 24-15.
24.2.14 INS Updates (not available in AINS).
Radar -
1. Master mode - NAV (RADAR SURF) or A/G
2. Radar mode - EXP 1, EXP 2, EXP 3, or MAP
3. WYPT - SELECT
4. NAV DSG - PRESS
5. TDC/DC - ASSIGN TO RADAR
6. UPDT - PRESS
A1-F18EA-NFM-000
VII-24-42 ORIGINAL
Figure 24-14. Navigation Designation (NAVDSG)
A1-F18EA-NFM-000
VII-24-43 ORIGINAL
Figure 24-15. Overfly Designation
A1-F18EA-NFM-000
VII-24-44 ORIGINAL
7. DSG - PRESS
8. Slew cursor over waypoint and release TDC/DC.
9. Accept or reject.
HUD -
1. WYPT - SELECT
2. NAV DSG - SELECT
3. TDC - ASSIGN TO HUD
4. UPDT - PRESS
5. DSG - PRESS
6. Slew HUD diamond over waypoint and release TDC/DC.
7. Accept or reject.
Overfly -
1. WYPT - SELECT
2. TDC/DC - ASSIGN TO MPCD
3. UPDT - PRESS
4. DSG - PRESS
5. Actuate TDC/DC when aircraft is over way point.
6. Accept or reject.
AUTO -
1. WYPT - SELECT
2. TDC/DC - ASSIGN TO MPCD
3. UPDT - PRESS
4. AUTO - PRESS
5. Actuate TDC/DC when aircraft is over way point.
Map -
1. WYPT - SELECT
2. UPDT - PRESS
A1-F18EA-NFM-000
VII-24-45 ORIGINAL
3. MAP - PRESS (automatically assigns TDC/DC to MPCD)
4. Overfly desired geographical reference and actuate TDC/DC.
5. Select slew and slew map reference under aircraft symbol, release TDC/DC.
6. Accept or reject.
TACAN -
(1 of 10 available TACAN stations must be in reception range)
1. UPDT - PRESS
2. TCN - PRESS
3. Accept or reject.
Velocity -
1. UPDT - PRESS
2. VEL - PRESS
3. Accept or reject.
24.3 ADF (AUTOMATIC DIRECTION FINDER)
The OA-8697/ARD ADF is a VHF/UHF direction finder operating in the 100 to 400 MHz frequency
range. The system has an antenna section which receives and modulates rf signals and an audio
processing section which resolves bearing in the ADF audio received from the VHF/UHF receivertransmitter.
Bearing information received by the ADF is sent to the MC where the data is processed
to position the ADF bearing pointer on the HSI display. The channel to the station to which ADF
bearing is required is selected on the COMM 1 or COMM 2 radio. The ADF system is turned on by
selecting the ADF option on the UFCD COMM sublevel for the selected radio. Squelch is disabled for
the selected radio when ADF is turned on. Squelch can be reenabled by reselecting the SQCH option.
Selecting the COMM 2 radio indicates ADF bearing to the station selected on the COMM 2 radio.
ADF audio is adjusted by either the COMM 1 or COMM 2 volume control knob. ADF symbology
appears as a small circle on the HSI display.
24.4 TACAN (TACTICAL AIR NAVIGATION)
The RT-1159A/ARN-118 TACAN system gives precise relative bearing and/or slant range distance
　
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