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After datum is entered the spheroid will automatically be displayed on the
pilots MFD.
7. ELEV key Activates keyboard to accept entry of elevation of present position in meters.
Elevation in feet may be entered by entering an F after the elevation.
8. MAG HDG key Activates keyboard to accept entry of ships magnetic heading in degrees.
9. POS key Activates keyboard to accept entry of present position coordinates. A WPT/
TGT ID may be entered in lieu of position data. The WPT/TGT position data
will automatically be used. NAV ALIGN data from the DTS will also be used
during mission loading.
(CDS4)
10. GPS SAT DATA Display GPS satellite data is displayed in the box in the center of the page. The box
contains five lines of data that display the following:
Line 1 Displays GPS SAT DATA.
Line 2 Displays the number of satellites being tracked and the quality of the signal.
It consists of the following line of text:
SATS X AAA
a. X indicates the total number of satellites being tracked that are either in
State 3 or State 5. States 3 and 5 are defined as follows:
(1) State 3: Unclear signal from manmade or natural disruption. Lock on
code but no carrier signal.
(2) State 5: Clear signal. Lock on code and carrier signal.
b. The character string AAA is one of the following:
(1) Advisory is false.
(2) DEGRADED - At least one satellite in State 3 is being tracked and
the GPS FAIL advisory is false.
(3) Fail advisory is false.
c. If the GPS FAIL advisory is true, line 2 will only display text SATS.
Line 3 Displays text IFA GO/NOGO.
a. GO is boxed if the EGI is in the alignment mode, GPS FAIL is false,
and the SATS status (Line 2) is CLR.
b. NOGO is boxed if the EGI is in the alignment mode, GPS FAIL is false,
and the SATS status (Line 2) is DEGRADED.
c. GO/NOGO is blanked if GPS FAIL advisory is true.
d. Text line is blanked if/when alignment is complete.
Figure 3-27. NAV ALIGN Page-UTM (Sheet 2 of 3)
3-52
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
Line 4 Displays text SA/AS.
a. SA is boxed if the SATS status is CLR, EGI is not operating in the ALL
Y Code mode, and the GPS FAIL advisory is false.
b. AS is boxed if the SATS status is either DEGRADED or blank, EGI is
operating in the ALL Y Code mode, and GPS FAIL advisory is false.
c. SA/AS is boxed if the SATS status is CLR, EGI is operating in the ALL
Y Code mode, and GPS FAIL is false.
d. Nothing will be boxed if the SATS status is DEGRADED or blank, EGI
is not operating in the ALL Y Code mode, and GPS FAIL is true.
Line 5 Displays status for the key mode. Text consists of a status message and a
single number to the right of the status message. This number indicates the
number of key mode status messages that are true. If more than one key
mode status message is true, the messages will be displayed in a rotary
mode and each message will be displayed for 3 seconds. The following
messages may be displayed:
a. KEY VERIFIED. Daily key in use has been verified.
b. KEY UNVERIFIED. Daily key in use has not been verified.
c. KEY INVALID. Daily key in use is invalid.
d. FAILED KEY. Failed parity.
e. 2 HOUR ALERT. Current key expires in 2 hours or less.
f. GPS FAILED. GPS failed.
Figure 3-27. NAV ALIGN Page-UTM (Sheet 3 of 3)
3-53
TM 1-1520-248-10
If the helicopter leaves the ground (or the ships deck) required unless a new alignment position is
prior to completion of alignment, the system will enter desired.
the in-flight alignment mode, indicated by appearance
Set as follows:
of the text IF ALIGN at the bottom center of the NAV
ALIGN page. The in-flight alignment mode is designed
to get the helicopter in the air as quickly as possible 1. NAV ALIGN  Select.
after system power up. SCAS may be engaged, and
takeoff may be accomplished immediately after pitch, 2. UTM or LAT/LONG  Select as required.
roll, and heading data appear on the VSD page.
System alignment will be accomplished in the air. 3. POS  Enter,
or
NOTE LAT, LONG  Enter.
Shipboard and in-flight alignments are 4. MAG HDG  Required for SHIP ALGN only.
dependent on the availability of accurate
position information updates to the system 5. DATUM  Enter (See Table 3-2).
during the alignment process. Normally,
GPS will provide this data. In the event that 6. ELEV  Enter.
GPS is unavailable, manual updates may be
entered by the pilot on the HSD page. 7. MANUAL align  Select and press as
desired.
3-56. NAV ALIGN PAGE (LAT/LONG). 8. FAST align  Select and press as desired.
The NAV ALIGN page (LAT/LONG) (fig. 3-28 and 3-29)
　
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