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SEL key. A map offset submode may be selected by corresponding key. The three EGI solution sources that
pressing the MAP OSET key on the right side of the may be selected are GPS/INS, GPS, or INS. The EGI
screen. can be commanded to accept P(Y) code only.
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PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD MMS COMM
330
300
240
210
S
150
120
060
030
N
NAV
DATA
WPT
LIST
5IP
6IP
7CP
MAP
OSET
SCL
SEL
FK-0684-9092 1:50 9
30 KPH
4.5 ETE
L 0.0 XTK
2.3KM
DIR
WPT
NEXT
WPT
LAST
WPT
NAV
UPD
PP
2 3 4 5 6 7 8
9
10
E
11
12
13
14
15
1
CONFIRM
376M
REJECT
UPD
MARK
STORE
POS
REJECT
STORE
HORIZONTAL SITUATION DISPLAY
NAV
MODE
GPS/INS
FPLN
406075-1525-6
J0860
25
26
27
22
21
20
19
18
17
16
23
24
28
29
30
31T
50T
W
6IP
CONTROL/INDICATOR FUNCTION
1. Waypoint distance Displays distance to waypoint listed. This waypoint can be the next waypoint in
the flight plan by pressing NEXT WPT key, the previous waypoint in the flight plan
by pressing LAST WPT, or a direct waypoint when it is entered.
2. MMS bearing indicator Indicates line-of-sight bearing of the mast mounted sight.
3. Target waypoint Indicates any stored targets within the range of those waypoints entered as
waypoint 31 through 60.
4. Compass rose 360° scale that rotates to give helicopter heading at the top of the display. The
inside edge of the compass rose encircles the flight plan route according to
selected map scale.
5. Helicopter symbol Stationary cross at the center of the display that represents the helicopter position
relative to the flight plan route displayed.
Figure 3-36. (CDS2) Horizontal Situation Display (HSD) Page (Sheet 1 of 3)
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(Cont)
CONTROL/INDICATOR FUNCTION
6. Flight plan route Preselected waypoints connected by straight lines that represent flight plan
displayed to scale as it is listed on the FLIGHT PLAN page. Route moves in
relation to helicopter symbol.
7. Bearing caret Indicates magnetic bearing to the next waypoint in the flight plan.
8. Navigational data Optional display called up by pressing NAV DATA key which displays (KPH for
UTM and KTS for LAT/LONG), estimated time enroute (ETE) in minutes and
tenths for both modes, and crosstrack distance (XTK) in kilometers for UTM and
nautical miles for LAT/LONG.
9. NAV DATA key Calls up and deletes navigational data in upper right corner of display.
10. WPT LIST key Calls up WPT LIST page.
11. 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).
12. MAP OSET key Calls up Map Offset page.
13. SCL SEL key Alternates display scales 1:50,000, 1:100,000, 1:250,000, or 1:500,000 each time
key is pressed.
14. Figure of merit The navigation figure of merit (FOM) displays in the lower right corner. The FOM
indicates to the operator the expected navigation system position accuracy. The
FOM is not displayed when the navigation system is declared invalid. The FOM
consists of a single digit, 1 through 9. 1 is best and 9 is worst.
15. Scale indication Indicates display scale that is presently displayed. Scale is changed with SCL
SEL key.
16. FPLN key Calls up FLIGHT PLAN page to display.
17. Present position Indicates present position of the helicopter in UTM or LAT/LONG coordinates. Not
displayed if EGI is in an alignment.
18. PP key Calls up or deletes display of present position coordinates.
19. NAV UPD key Pressing key redefines NAV UPD and PP keys as UPD MARK and STORE POS
respectively. See callouts 20 thru 27 for paging sequence to navigational updating
and store position modes.
20. LAST WPT key Accesses the last waypoint. It causes the current waypoint to be decremented to
the previous waypoint in the flight plan sequence. The box enclosing the current
waypoint is moved up to identify the new current waypoint on the FLIGHT PLAN
page.
Figure 3-36. (CDS2) Horizontal Situation Display (HSD) Page (Sheet 2 of 3)
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(Cont)
CONTROL/INDICATOR FUNCTION
21. NEXT WPT key Accesses the next waypoint. It causes the current waypoint to be incremented to
the next waypoint in the flight plan sequence. The box enclosing the current
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(74)
