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through selection and depression of the
associated VABs for the sub-page desired. VAB functions
are explained in table 3-22.9.
Figure 3-25.12. DATA Top Level Menu Page
Line 1. - Left-hand character field displays the legend
ONAV STAT. The right-hand character field displays
the legend GPS STATO.
Line 2. - Displays the centered page title DATA
MENU.
Line 3. - The left-hand character field displays the legend
ONAV SENSOR CONTROL.
Line 4. - Blanked.
Line 5 - Left-hand character field displays the legend
ODTU.
Line 6. - Blanked.
Change 4 3-64.15
TM 1-1520-238-10
Table 3-22.9. DATA PAGE VAB OPERATIONS
Control/Display Function
VAB l Selectes NAV STATUS Page.
VAB 2 Selects NAV SENSOR CONTROL Page.
VAB 3 Selects DTU CONTROL Page.
VAB 4 Selects ZEROIZE Page.
VAB 5 Selects GPS STATUS Page.
VAB 6 Inactive
VAB 7 Energizes HQ Sync relay for 5 seconds. Supplies GPS UTC signal to ARC-164
VAB 8 Inactive
a. Navigation Status (NAV STATUS) Page. The INIT - - - - Initialization
NAV STATUS page is accessed by depressing VAB 1 on
the DATA Menu page. The NAV STATUS page is dis-
LEVEL - - -Leveling
played as shown in figure 3-25.13. All data displayed on TEST - - - - Internal Test
the NAV STATUS page is read-only data and noneditable.
VABs 1-7 are inactive, and VAB 8 is used to
CGA- - - - - Coarse Ground Align
return to the DATA MENU top level page. FGA - - - - - Fine Ground Align
ICGA - - - - Interrupted Coarse Ground Align
CSA- - - - - Coarse Sea Align
FSA - - - - - Fine Sea Align
Line 2. - Displays the centered page title NAV STATUS.
IFGA - - - - Interrupted Fine Ground Align
CIFA - - - - Coarse Inflight Align
FIFA - - - - Fine Inflight Align
Line 3. - The left-hand character field displays INS
status information from the following list:
Figure 3-25.13. NAV STATUS Page
INS ATT? - - - - - INS attitude data invalid
INS VEL? - - - - - -INS airframe coord. velocity invalid
Line 1. - Left-hand character field displays the legend
EPE (Estimated Position Error) followed by the error
INS HDG? - - - - - INS heading data invalid
stated in Meters (XXXXM). The distance error display
is limited to four (4) characters, or a maximum of
INS NOGO ----INS not operationally useable
9999M. The right-hand character field displays the INS GO ----- INS aligned and operational
current INS mode ofoperation. Possible displays in this
character field, dependent upon whether The right-hand character field displays GPS status in-
MODE:LAND or MODE:WATER is selected are: formation from the following list:
3-64.16 Change 4
TM 1-1520-238-10
GPS NOGO- - - - - G P Snot operationally useable
GPS BATT LO -- GPS battery voltage low
GPS GO-------- GPS is operational
Line 4. - Blanked.
Line 5 - The left-hand character field displays DNS
status information of DNS GO or DNS NOGO. The
right-hand character field displays HARS status information
from the following list:
HARS CAL --- HARS calibration mode
HARSATT? - - - HARS attitude data invalid
HARSVEL? - - - HARS velocity data invalid
HABSHDG? - - HARS heading data may be invalid
HARS TST --- HARS in internal test mode
HARSLAT? --- HARS latitude may be invalid
HARSFAST - - - HARS in fast align mode
HARSNORM - - BARS in normal align mode
HARS GO ----- HARS aligned and operational
HARSNOGO --- HARS is not operationally usable
Line 6. - Displays System Annunciator Data.
Line 7. - The right-hand character field displays the
legend DATAO.
Line 8. - Blanked.
b. Navigation Sensor (NAV SENSOR CONTROL)
Page. The NAV SENSOR CONTROL page is accessed
by depressing VAB 2 on the DATA Menu page.
The NAV SENSOR CONTROL page is displayed as
shown in figure 3-25.14. VAB 7 is used to return to the
DATA MENU top level page. VAB functions are explained
in table 3-22.10.
Figure 3-25.14. NAV SENSOR CONTROL Page
Line 1. - Left-hand character field displays the legend
MODEWATER or MODE:LAND.
Line 2. - Displays the centered page title NAV SENSOR
CONTROL.
Line 3. - The left-hand character field displays WKA
XXX/YYKPH only when MODE:WATER is displayed
on line 1; otherwise, this field is blanked.. When WKA
XXX/YYRPH is displayed, the XXX/YY will appear as
dashes until the Ground Track/Ground Speed entry is
made. Subsequently, it will display system ground
track and speed.
Line 4. - Blanked.
Line 5 - Left-hand character field displays the legend
DNS RF:OFF or DNS RF:ON.
Line 6. - Displays System Annunciator Data.
Line 7. - The right-hand character field displays the
　
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