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ENT Not Used.
CLR If pressed in response to an ERROR prompt in the scratch pad, will clear the error
prompt and position the cursor at the first detected data entry error. If pressed a second
time, will clear the entire scratch pad. If no ERROR prompt, will clear the entire
scratch pad.
PGM Access to Program Top Level page.
IDNT Not Used.
WPN Access to Weapon Control Top Level page.
FPLN Access to Way point LIST page.
STR Stores PPOS in next way point store location (31-40), overwriting existing data.
Change 3 3-64.3
2
TM 1-1520-238-10
Table 3-22.1. NAV TOP LEVEL PAGE VARIABLE ACTION BUTTONS
Control/Display Function
VAB 1 If NAVSTAT 1 is displayed on line 6 of the NAV page, VAB 1 is disabled.
Depressing the VAB 1 button with no data present in the scratchpad freezes the current
displayed PPOS data and changes the PPOS legend to Þ UPD indicating the system is
ready for a manual PPOS update. A second depression of VAB 1 with no scratchpad data
present aborts the manual update.
Depressing the VAB 1 button with data present in the scratchpad that satisfies the
PPOS, Datum, or MAGVAR data entry rules, then the intended system parameter will
be updated.
Used for manually entering PPOS and Datum updates. Allows manual MAGVAR
updates when the outlined arrow a is displayed in character position 1 on line 2.
VAB 2 Not Active.
VAB 3 Not Active.
VAB 4 When depressed, if the left-hand character field in line 7 displays the legend UPD TO,
will complete a fly over type PPOS update; and display updated PPOS on line 1. When
updated data is accepted or aborted, line 7 will return to its’ previous legend of Þ FLY
TO.
With valid FLY TO data symbol (WXX or TXX with valid previously entered
coordinates) entered on the scratchpad, will change the active FLY TO to location
entered in scratchpad. Invalid scratchpad coordinate data will result in "ERROR"
message on scratchpad.
Without data in scratchpad; will display active FLY TO coordinates in scratchpad with
initial depression. Second depression will display the Associated data line (ID, Altitude
and Datum) for the active FLY TO coordinates. Subsequent depressions will toggle
between the FLY TO coordinates and the Associated Data. FLY TO coordinates and
Associated Data displayed in the scratchpad are for review purposes only, and cannot be
edited or transferred.
VAB 5 If NAVSTAT 1 is displayed on line 6 of the NAV page, VAB 5 is disabled.
Depression of VAB 5 with other than NAVSTAT 1 status while overflying a waypoint
will freeze the PPOS display on line 1 and changes the FLY TO legend on line 7 to UPD
TO. Reselection of VAB 5, or selection of any other page, will abort the update.
VAB 6 Presents the ADMIN sub page when depressed.
VAB 7 Not Active.
VAB 8 Not Active.
3.16.7 CDU Displays. The CDU display architecture is
organized into page formats. Each page consists of 8
display lines. All lines are 22 characters wide. The
bottom line (eighth) is used as a scratchpad for entering
or editing data. Individual pages may display navigation
data, display failure messages, or indicate selectable
functions. The CDU displays are categorized into 8 top
level page formats: NAV, TGT, DATA, CODE, FDLS,
PGM, WPN, and FLPN. The CDU will automatically
revert back to the NAV top level page from the ADMIN
page after 30 seconds if there are no characters in the
scratchpad and no other key presses are made.
0-64.4 Change 3
3
TM 1-1520-238-10
NAV Top Level Page. When the DNS is powered, the
NAV top level page (fig 3-26.1) will display the following:
Figure 3-26.1. NAV Top Level Page (UTM Format)
Line 1. Displays the legend PPOS followed by the current
PPOS coordinates. PPOS represents the computed
present position in either UTM or LAT/LONG
coordinates. PPOS changes to OUPD when an on-the
move manual PPOS update is initiated.
Line 2. The left-hand character field displays the legend
VAR followed by the PPOS MAGVAR in degrees. If the
INS is NO-GO, an outlined arrow (O) will be displayed
immediately to the left of VAR permitting manual
MAGVAR updates. The right-hand character field
displays the legend D followed by the PPOS Datum
number.
Line 3. The left-hand character field displays the legend
BRG XXXDEG reflecting the direct bearing to the
destination specified in the FLY TO legend. The BRG
legend is a read-only display. The right-hand character
field displays the legend ADMIN. An outlined arrow (O)
following ADMIN indicates the ability to select the ADMIN
page for display.
Line 4. -The left-hand character field displays the legend
　
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