TM 1-1520-238-10
Change 8
3-64.17
Table 3-22.9.
DATA PAGE VAB OPERATIONS
Control/Display
Function
VAB 1
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
NAV STATUS page is accessed by depressing VAB 1 on
the DATA Menu page. The NAV STATUS page is dis-
played as shown in figure 3-25.13. All data displayed on
the NAV STATUS page is read–only data and non–edit-
able. VABs 1–7 are inactive, and VAB 8 is used to return to
the DATA MENU top level page.
M01-0341
EPE XXXXM INIT
NAV STATUS
INS GO GPS GO
DNS GO HARS GO
MEM NAV STAT3 3 FDLS
DATA
Figure 3-25.13.
NAV STATUS Page
Line 1. – Left–hand character field displays the legend
EPE (Estimated Position Error) followed by the error
stated in Meters (XXXXM). The distance error display is
limited to four (4) characters, or a maximum of 9999M.
The right–hand character field displays the current INS
mode of operation. Possible displays in this character
field, dependent upon whether MODE:LAND or
MODE:WATER is selected are:
INIT–––––Initialization
LEVEL–––Leveling
TEST––––Internal Test
CGA–––––Coarse Ground Align
FGA–––––Fine Ground Align
ICGA––––Interrupted Coarse Ground Align
IFGA––––Interrupted Fine Ground Align
CIFA––––Coarse Inflight Align
FIFA––––Fine Inflight Align
CSA–––––Coarse Sea Align
FSA–––––Fine Sea Align
Line 2. – Displays the centered page title NAV STATUS.
Line 3. – The left–hand character field displays INS status
information from the following list:
INS ATT?–––––INS attitude data invalid
INS VEL?––––––INS airframe coord. velocity invalid
INS HDG?–––––INS heading data invalid
INS NOGO––––INS not operationally useable
INS GO–––––INS aligned and operational
The right–hand character field displays GPS status infor-
mation from the following list:
