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DATUM 25
SPHEROID CL6
SHIP ALGN
GPS SAT DATA
SATS 4 CLR
IFA GO /NOGO
SA /AS
KEY VERIFIED 3
(CDS4) 11
406075-1525-4
J2995
CONTROL/INDICATOR FUNCTION
1. AUTO/MANUAL key Activates a manually initiated, 4-minute alignment. “AUTO” is boxed during
normal system start-up.
2. FAST key Activates fast align mode using stored heading from last mission or defaults
to standard 4-minute alignment.
3. NAV MODE key Calls up NAV MODE SELECT page to allow for the change of the EGI mode
of operation. Displays currently selected mode (GPS/INS, GPS, INS).
4. SHIP ALGN key Activates shipboard alignment based on ships magnetic heading.
5. UTM LAT/LONG key Toggles between UTM and LAT/LONG with the active mode boxed. When
changing between UTM and LAT/LONG, inaccurate navigation data may be
displayed. To correct problem, verify the correct DATUM entry was made on
NAV ALIGN page. If problem still exists, from HSD page cycle NEXT WPT/
LAST WPT.
Figure 3-29. NAV ALIGN Page-LAT/LONG (Sheet 1 of 3)
3-58
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
6. DATUM/SPHEROID key Activates keyboard to accept entry of local map datum code, or datum last
entered will be displayed. These datums are located in the legend area at
the bottom of tactical maps. Refer to Table 3-3 for world datum locations.
After datum is entered the spheroid will automatically be displayed on the
pilot MFD.
7. ELEV key Activates keyboard to accept entry of elevation of present position in meters.
Elevation in meters may be entered by entering an M.
8. MAG HDG key Activates keyboard to accept entry of ships magnetic heading in degrees.
9. LONG key Activates keyboard to accept entry of longitude of present position in
degrees, minutes, and hundredths of minutes; east or west.
10. LAT key Activates keyboard to accept entry of latitude of present position in degrees,
minutes, and hundredths of minutes; north or south.
(CDS4)
11. 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 3-29. NAV ALIGN Page-LAT/LONG (Sheet 2 of 3)
3-59
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.
　
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