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serves the same function as the NAV ALIGN page UTM NOTE
and is used when latitude and longitude are to be used
for navigation. This mode allows entry of latitude north If FAST align is to be used, the aircrafts last
or south and longitude east or west in degrees, present position must be stored immediately
minutes, tenths, and hundredths, and elevation in feet. prior to shutdown from ground idle and the
When NAV ALIGN data is entered in LAT/LONG format, aircraft must not be moved from that
data will not be retained in nonvolatile memory after position prior to the next system power up.
shutdown.
9. SHIP ALGN  As required.
3-57. NAV ALIGN PROCEDURES.
NOTE
The EGI will automatically begin a standard
4-minute alignment. No user action is
3-54
TM 1-1520-248-10
Table 3-2. Horizontal reference datums
ID # Datum Title Spheroid
1 Adindan Clarke 1880
2 ARC 1950 Clarke 1880
3 Australian Geodetic 1984 Australian National
4 Bukit Rimpah Bessel
5 Camp Area Astro International
6 Djakarta Bessel
7 European 1950 International
8 Geodetic Datum 1949 International
9 Ghana WGS 84
10 Guam 1963 Clarke 1866
11 Gunung Segara Bessel
12 Gunung Serindung WGS 84
13 Herat North International
14 Hjorsey 1955 International
15 Hu-Tzu-Shan International
16 Indian Everest
17 Ireland 1965 Modified Airy
18 Kertau (Malayan Revised Triangulation) Modified Everest
19 Liberia 1964 Clarke 1880
21 Luzon Clarke 1866
22 Merchich Clarke 1880
23 Montjong Lowe WGS 84
24 Nigeria (Minna) Clarke 1880
25 North American 1927 (CONUS) Clarke 1866
26 North American (Alaska and Canada) Clarke 1866
27 Old Hawaiian, Maui International
28 Old Hawaiian, Oahu International
29 Old Hawaiian, Kauai International
30 Ordnance Survey of Great Britain 1936 Airy
31 Qornoq International
32 Sierra Leone WGS 84
33 South American (Provisional 1956) International
34 South American (Corrego Alegre) International
35 South American (Campo Inchauspe) International
36 South American (Chua Astro) International
37 South American (Yacare) International
38 Tananrive Observatory 1925 International
39 Timbalai Bessel
40 Tokyo Bessel
41 Voirol WGS 84
42 Special Datum, Indian Special Everest
43 Special Datum, Luzon Special Clarke 1866
44 Special Datum, Tokyo Special Bessel
45 Special Datum, WGS84 Special WGS 84
46 WGS 72 WGS 72
47 WGS 84 WGS 84
(TABLE I.D. 911465)
3-55
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
NAV ALIGN
AUTO / MANUAL
FAST
UTM LAT/LONG
8
7
6
5
2
1
3
4
LAT N 89° 59.48
MAG HDG 135
ELEV 2208 F
LONG E179° 35.12
406075-1525-3
J0860
SHIP ALGN
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. SHIP ALGN key Activates shipboard alignment based on ships magnetic heading.
4. 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.
5. ELEV key Activates keyboard to accept entry of elevation of present position in meters.
Elevation in meters may be entered by entering an M.
6. MAG HDG key Activates keyboard to accept entry of ships magnetic heading in degrees.
Figure 3-28. (CDS2) NAV ALIGN Page-LAT/LONG (Sheet 1 of 2)
3-56
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
7. LONG key Activates keyboard to accept entry of longitude of present position in
degrees, minutes, and hundredths of minutes; east or west.
8. LAT key Activates keyboard to accept entry of latitude of present position in degrees,
minutes, and hundredths of minutes; north or south.
Figure 3-28. (CDS2) NAV ALIGN Page-LAT/LONG (Sheet 2 of 2)
3-57
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
NAV ALIGN
AUTO / MANUAL
FAST
UTM LAT/LONG
2
LAT N 89° 59.48 1
MAG HDG 135
ELEV 2208 F
3
4
6 5
7
8
NAV
MODE
GPS/INS
9
10
LONG E179° 35.12
　
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