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the next waypoint is selected for further waypoint data entry.
Offset aimpoints may also be entered using the map slew method; however, the associated offset
must be entered through the UFCD.
24.2.7.1.1 GPS Waypoint Programming. Aircraft with GPS can utilize the GPS to store up to 200
waypoints. GPS points are loaded into the GPS from the memory unit. GPS points can be displayed
and/or transferred into the MC waypoint data base using the HSI/DATA/GPS display. A GPS point
can be transferred into any MC waypoint by pressing the XFER option on the GPS display. When GPS
option is selected the first 24 GPS points are displayed in alphanumeric order. Selection of points to
load is accomplished by the right and down arrows and page selection arrows. Repeated selection of
these arrows causes the cursor to wrap around. It may take as long as three seconds to retrieve selected
position data and display it on the GPS display. See figure 24-7. GPS waypoints are transferred to the
MC by selecting the desired waypoint number with the up/down arrows on the HSI/DATA/GPS
sublevel, moving the cursor down/right and/or page up/down to the desired waypoint ID code, and
pressing XFER. The GPS LAT/LONG, GPS altitude, and current ID code displays are blanked and
the XFER option is removed. The selected ID code is displayed in the ``Current ID'' position indicating
that waypoint is requested. After approximately 3 seconds, the requested GPS LAT/LONG and GPS
altitude is displayed and the XFER option is returned for transfer selection. If a GPS ID code is
requested and is not available, the selected ID code is displayed with a line through it. Once a GPS
waypoint has been transferred from the GPS to the MC it becomes an MC waypoint. The waypoint ID
code is retained and is displayed on the top level HSI and HSI/DATA/WYPT formats when the
waypoint is selected as the current waypoint.
24.2.7.1.2 UTM Data Entry. Data for all waypoints and OAPs may be entered as universal transverse
mercator (UTM) coordinates. See figure 24-8. UTM grid coordinates are defined by a spheroid, grid
zone designation, square identification, and easting/northing. Grid zone designation divides the world
area between N84° and S80° into 100 km squares. At power up with WonW the MC initializes
waypoint elevation, O/S range and elevation, and TACAN elevation in FEET, and O/S bearing to
TRUE. UTM data for waypoints are entered by performing the following:
1. Select DATA/WYPT on the HSI top level display.
2. Select the desired spheroid by selecting the spheroid option.
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3. Select UFC on the HSI. The first cockpit to select UFC has control of grid data entry and has the
GRID display on the RDDI.
4. Select GRID on the UFCD. The MC determines the grid zone designation and 100 km square ID
of the reference position and constructs a five by five Square Identification Grid (SIG) centered
about the reference position and displayed on the RDDI. Reference position is either the A/C
present position or the referenced waypoint position (REF WP Boxed).
5. Slew the acquisition cursor into the desired square, depress and release the TDC.
6. On the UFCD enter the six digit easting/northing and press ENT. Leading zeros must be input
for easting/northing. The UTM coordinates are displayed on the HSI under the lat/long provided
the latitude is within the N84° to S80° limits.
UTM data for O/S are entered by performing the following:
7. Select DATA/WYPT on the HSI top level display.
8. Select UFC on the HSI.
9. Select O/S on the UFCD.
10. Select Grid on the UFCD.
Figure 24-7. GPS Waypoint Display
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11. Slew the HOTAS cursor into the desired square, depress and release the TDC.
12. Enter O/S easting/northing in the UFCD.
The MC converts the UTM Grid coordinates to latitude/ longitude and then to range and bearing.
O/S coordinates more than 400,000 feet from the OAP cause the UTM coordinates to flash in the O/S
grid field on the HSI. The UTM coordinate is displayed in the O/S field on the HSI.
SIG square blanking must be checked any time the SIG is built. If the latitude is out of UTM range
(above N84°or below S80°) the entire row is blanked. At certain latitudes, due to the convergence of
the earth, individual squares are blank.
Grid shift options are provided to view and select grid squares in the eight adjacent grid squares
whenever the A/C or Waypoint symbol is in the center square of the SIG and the adjacent SIGs exist.
See figure 24-8. N, S, E, W, SE, SW, NE, or NW can be selected by pressing the grid shift options on
the HSI, or by pressing and releasing the TDC when the HOTAS cursor is over a grid shift push button
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NATOPS Flight Manual 飞行手册 2(98)
