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optional submode of the HSD page. It is called up by flight plan. It is called up by pressing the DIR WPT key
pressing the MAP OSET key on the right side of the on the top left corner of the HSD page. The DIR WPT
HSD. The purpose of this function is to expand the page looks similar to the NEW WPT page. If the
display distance forward of the helicopter. When the waypoint to be directly flown to is already in the
MAP OSET key is pressed, the helicopter symbol shifts waypoint list, entering its identifier and storing it is all
to the bottom center of the display and the compass that is necessary to initiate the direct waypoint function.
rose is expanded. This increases the display distance If the waypoint is not already listed in the waypoint list,
forward of the helicopter position from approximately then a similar data entry procedure (identifier,
2.5 kilometers (1.5 nautical miles) to 5 kilometers (3 coordinates, elevation, etc.) as would be accomplished
nautical miles) on the 1:50,000 scale, from 5 kilometers for a new waypoint must be completed on the DIR WPT
(3 nautical miles) to 10 kilometers (5.5 nautical miles) page.
on the 1:100,000 scale, from 12 kilometers (6.5 nautical
miles) to 24 kilometers (13 nautical miles) on the
1:250,000 scale, and from 24 kilometers (13 nautical Upon storing this data, the direct waypoint function
miles) to 48 kilometers (26 nautical miles) on the would be initiated. This is indicated by the replacement
1:500,000 scale. The MAP OSET key legend changes of the flight plan depiction on the HSD page with that of
to MAP CNTR when in the map offset mode. Pressing the direct waypoint selected and the replacement of the
the MAP CNTR key returns the screen to the normal DIR WPT label on the top left of the HSD page with the
HSD mode, and MAP OSET returns to the key legend. return to flight plan (RTN FPLN) label. When the direct
waypoint mode is no longer needed, press the RTN
FPLN key to return to the normal HSD page. When the
3-71. DIRECT WAYPOINT PAGE. normal HSD page returns, distance and bearing data to
the next waypoint will automatically be displayed
This mode allows the crew to deviate from the flight relative to the position of the aircraft. The WPT LIST
plan being used to fly directly to a new waypoint pages will display the selected direct waypoint
without changing prestored flight plan. The Direct coordinates at the bottom of each page.
3-78
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD MMS COMM
330
300
240
210
S
150
120
E
060
030
N
29T
1:50 9
2RS
1
0.7 NM
29T
TACAN
MAP
TACAN
HSI
115
GPS/INS
FPLN
406075-1525-8
J0860
2 P (Y) ONLY
3
4
W
CONTROL/INDICATOR FUNCTION
1. GPS/INS key Activation of this key will select the EGI navigation mode and will select one
of the three EGI navigation solutions (GPS, INS, GPS/INS).
NOTE
While in the P(Y) ONLY mode, the GPS receiver within the EGI uses only
satellite signals from the Precise Positioning Service (PPS). When the P(Y)
ONLY mode is not selected, the GPS navigates using both military PPS signals
as well as commercial signals known as Selective Positioning Service (SPS).
2. P(Y) ONLY key Toggles between mixed mode and P(Y) ONLY mode.
NOTE
The TACAN MAP and TACAN HSI keys are inactive if TACAN is not installed.
3. TACAN MAP key Activates the TACAN MAP page and sets the navigation mode to TACAN
MAP.
4. TACAN HSI key Activates the TACAN HSI page and sets the navigation mode to TACAN
HSI.
Figure 3-38. NAV Mode Select Page
3-79
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD MMS COMM
1
FPLN
GPS/INS
NAV MODE SELECT
TACAN
MAP
TACAN
HSI
406075-1573-18
J1257
2 P(Y) ONLY
3
4
CONTROL/INDICATOR FUNCTION
1. GPS/INS key Activation of this key will select the EGI navigation mode and will select one
of the three EGI navigation solutions (GPS, INS, GPS/INS).
NOTE
While in the P(Y) ONLY mode, the GPS receiver within the EGI uses only
satellite signals from the Precise Positioning Service (PPS). When the P(Y)
ONLY mode is not selected, the GPS navigates using both military PPS signals
as well as commercial signals known as Selective Positioning Service (SPS).
2. P(Y) ONLY key Toggles between mixed mode and P(Y) ONLY mode.
NOTE
The TACAN MAP and TACAN HSI keys are inactive if TACAN is not installed.
3. TACAN MAP key Activates the TACAN MAP page and sets the navigation mode to TACAN
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(77)
