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entered, its value defaults to the value associated with
present position.
Rule 4 - Magnetic Variation Change. A change can be
made to magnetic variation without changing LATT/
LONG coordinate data or affecting their values.
m. LATT/LONG Coordinate Entries for
PPOS. When an incomplete set of LATT/LONG coordinates
and magnetic variation is entered into PPOS, the
following exception applies:
NOTE
A change in latitude must be accompanied by a
change in longitude. Magnetic variation remains
unchanged.
Change 3 3-59
TM 1-1520-238-10
n. CDU Validity Checks for LATT/LONG Coordinate
Data. The CDU checks the parameters of all data
entered into the scratchpad. Any nonvalid characters
are flagged as erroneous. Valid parameters are shown
in table 3-20.
Table 3-20. LAT/LONG Coordinate Data
Parameter Valid Entries
PPOS N or S only.
Latitude 1st
Character
PPOS 00 - 84 for North latitude degrees.
Latitude 00 - 80 for South latitude degrees.
Degrees
PPOS Minutes 00.0 - 59.9.
PPOS E or W only.
Longitude 1st
Character
PPOS 000 - 180.
Longitudinal
Degrees
PPOS 00.0 - 59.9.
Longitude
Minutes
Magnetic E or W and 0 - 180.0 degrees.
Variation
FLY TO 1 - 19 and H or 0 H and 0 are synonymous.
o. Waypoint Dictionary Pages and Transfer Functions.
Up to 20 waypoints can be entered into the
waypoint dictionary at one time. The waypoint dictionary
pages are accessed via the FPLN FAB. If the CPG
desires to change display modes (UTM or LATT/
LONG) before making entries into the waypoint dictionary,
perform steps 1 and 2. If the mode does not need
to be changed, go to step 3.
1. ADMIN - Press. Observe that the ADMIN page
is displayed.
2. MODE UTM - Press. Observe that MODE UTM
changes to MODE L/L or vice versa and after
three seconds the NAV top level present position
page is displayed.
3. FPLN FAB - Press. Observe that FPLN waypoint
dictionary page 1 is displayed (Way- points
home, 1 and 2).
NOTE
Refer to UTM or LATT/LONG coordinate entries for
waypoint dictionary paragraphs for entry details.
Refer to CDU validity checks for UTM or
LATT/LONG coordinate data for data entry
parametersm
4. Enter the desired coordinates into the
scratchpad.
3-60 Change 3
TM 1-1520-238-10
5. VAB - Press adjacent to the desired location
(waypoint number). Observe that the scratchpad
is now blank and the data appears at the
desired waypoint location.
The CDU allows for the transfer of coordinate
data from one waypoint to another. To transfer
waypoints, set the CDU to MODE UTM
and follow the example.
EXAMPLE
6. FPLN FAB - Press. Observe that waypoint
dictionary page 1 (home, 1 and 2) is displayed.
7. Enter 12SWN00000000E12C6 into the
scratchpad.
8. VAB 1 - Press. Observe that the home waypoint
location now displays:
12S WN 0000 0000
E012.0 CL6
and the scratchpad is now blank.
9. VAB 5 - Press. Observe that the data in the
home location is unchanged and the scratchpad
now displays the data entered in step 2.
10. Press down arrow key. Observe that waypoint
dictionary page 2 (locations 3, 4, and 5) are
now displayed.
11. VAB 1 - Press. Observe that location 3 now
contains the same data as the home location.
p. Target Storage. The DNS target store function
operates similarly to the AN/ASN-128 target function.
To perform this function, press the STR FAB. This will
store DNS PPOS coordinate data, magnetic variation
and spheroid data values into the waypoint number
designated on line 7 of the NAV top level present position
page. The TGT STR number automatically increments
to the next higher number after each storage
function until it reached 19, then the counter will reset
to 16.
For example: TGT 17 specified that at the time the
STR FAR was pressed, the instantaneous DNS PPOS
data was stored into waypoint number 17.
q. On Command Test (FDLS). The On Command
Test is the manually initiated portion of the CDU and
DNS FDLS (para 3.15.c). If the continuous test causes
an FDLS message to be displayed on line 7 of the NAV
top level present position page do the following:
1. FDLS FAB - Press. Observe that the CDU/
DNS system status is displayed as shown in
figure 3-23.
M01-218-8
Figure 3-23. FDLS Status Page On-Command
Test Results NO-GO
NOTE
An END OF LIST message is displayed
following the last message (GO or NOGO).
If there are more than three malfunctions
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