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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. MAP OSET key Calls up Map Offset page.
12. SCL SEL key Alternates display scales 1:50,000, 1:100,000, 1:250,000, or 1:500,000 each
time key is pressed.
13. 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.
14. Scale indication Indicates display scale that is presently displayed. Scale is changed with
SCL SEL key.
15. RMS key Calls up Rotorcraft Mapping System (RMS) main page.
16. Present position Indicates present position of the helicopter in UTM or LAT/LONG
coordinates.
17. PP key Calls up or deletes display of present position coordinates, fuel burn rate,
and fuel time remaining.
18. 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.
19. 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 3-37. Horizontal Situation Display (HSD) Page (Sheet 2 of 4)
3-76
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
20. 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 waypoint is moved down to identify the new current
waypoint on the FLIGHT PLAN page.
21. DIR WPT key Calls up NEW WAYPOINT page to enter a direct waypoint for a new
destination enroute while maintaining current flight plan in memory.
22. UPD MARK key Displays after NAV UPD is pressed. Press this key to compare system
coordinates with actual coordinates when directly over a selected waypoint.
When the error is less than 300 meters, the system will update automatically
and key will revert back to original display. If the error is greater than 300
meters. CONFIRM and REJECT keys will replace UPD MARK and STORE
POS respectively with the amount of error displayed between the two keys.
If error is greater than 1000 meters, then 999 + will be displayed.
23. STOR POS key Activation of this key initiates the target position store and address key label
changes from STORE POS to REJECT.
24. CONFIRM key Displays after UPD MARK key is pressed replacing that key if the resulting
error between the system coordinates and actual coordinates is more than
300 meters. If the error magnitude displayed between CONFIRM and
REJECT is acceptable, press CONFIRM and the updated information is
entered and the key reverts back to NAV UPD.
25. Detected error The error detected between the system coordinates and the actual
coordinates of the waypoint measured in meters.
26. REJECT key Displays after UPD MARK key is pressed, replacing STORE POS if the
resulting error between the system coordinates and actual coordinates is
more than 300 meters. If the error magnitude displayed between CONFIRM
and REJECT is not acceptable, press the REJECT key. This will revert the
key back to PP.
27. STORE key Displays after STORE POS key is pressed replacing UPD MARK. If it is
desired to place the present position of the helicopter into memory, press
the STORE key. Present position will be stored in the next available storage
register as displayed and key will revert back to NAV UPD.
Figure 3-37. Horizontal Situation Display (HSD) Page (Sheet 3 of 4)
3-77
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
28. Store register Displays after STORE POS key is pressed. It depicts the next available
storage register on the WPT LIST page. This is where the present position
will be stored if the STORE key is pressed.
29. REJECT key Displays after STORE POS key is pressed replacing STORE POS. This key
is pressed to reject position storage and to revert the key back to PP.
Figure 3-37. Horizontal Situation Display (HSD) Page (Sheet 4 of 4)
3-70. MAP OFFSET PAGE. Waypoint page (fig. 3-42 and fig. 3-43) is an optional
submode of the HSD page and is a quick method for
The Map Offset page (fig. 3-40 and fig. 3-41) is an flying to a waypoint which is not listed in the current
　
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