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automatically boxed. When WYPT slew is selected on a DDI, all DDIs and UFCDs displaying the HSI
format are commanded to be driven by the DMS mono-map.
24.1.3.6 POS/XXX Option (HSI Format). This option is located along the top row of the HSI display
and when selected provides the POS/XXX sublevel display. This sublevel display allows the selection
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of AINS, INS, ADC, or TCN as the position keeping source. When one of these options is selected the
top level HSI display is returned, with the appropriate selection denoted (Ex. POS/ADC). POS/INS is
automatically selected during ground operations when INS data is valid. Should the INS fail, the MC
automatically begins position keeping with FCS air data function (ADC) from the last valid INS
position.
24.1.3.7 UPDT Option (HSI Format). The UPDT option is located along the top row of the HSI
display and when selected provides the UPDT sublevel display. This sublevel display allows the
selection of VEL (velocity), TCN, DSG (designation), AUTO, or MAP as the update source. Following
the selection of one of the update options, an ACPT/REJ (accept/reject) display is presented in which
the update can either be accepted or rejected. After selection of ACPT or REJ, the top level HSI
display is returned. There is no ACPT/REJ display presented when the AUTO option is selected.
Velocity update is described in the A1-F18EA-TAC-000. If a previous update has been accepted, a
CANCEL option is also displayed on the UPDT sublevel to allow the aircrew to cancel the last accepted
update.
24.1.3.8 MK Option (HSI Format). This option is located along the top row of the HSI display. The
mark option is initialized to MK1 upon power up with WonW, regardless of the previous selection. A
maximum of nine mark points may be entered. If all mark points have been used and another mark
point is entered, MK1 is replaced with the new mark data.
If a waypoint/OAP is not designated and the MK option is selected, the lat/long of the current
overfly point is stored with the elevation set to zero. If a location is designated, the lat/long of the
designated location is stored. In this situation, the aircraft altitude minus the altitude above the
designated target is stored as the elevation.
24.1.3.9 DATA Option (HSI Format). The data option is located along the top row of the HSI display.
Selecting this option provides the DATA sublevel display. This display is used to enter waypoint/OAP
data, aircraft data, TACAN data, waypoint/OAP sequence data, radar and barometric altitude
warning, groundspeed data, and TOT data; and to select the INS check display. After selection of
either the WYPT, A/C, or TCN option, the UFC or SEQUFC option is used to initialize the UFCD for
data entry. The HSI option is used to return the HSI display to the top level format.
24.1.3.10 WYPT, OAP Option (HSI Format). The WYPT, OAP option is located along the right side
of the HSI. WYPT is displayed when steering is to a waypoint. OAP is displayed when steering is to
an OAP. If either the WYPT or OAP option is selected (boxed), direct great circle steering is provided
to that waypoint/OAP. TGT is displayed at this location when a target is designated.
24.1.3.10.1 Waypoint, OAP, Mark Point Selection. Along the right side of the HSI display just below
the WYPT/OAP/TGT options, there are two arrows pointing in opposite directions with a number in
between. This number indicates the current steer to waypoint/OAP/mark. The waypoint/OAP being
steered to can be incremented/decremented by selecting the appropriate arrow option, changing the
steer to number. After all of the waypoints/OAPs have cycled through (0 through 59), the mark points
can be selected for display. Marks are displayed with an M preceding the number.
24.1.3.11 NAVDSG, O/S Option (HSI Format). This option is located along the right side of the HSI
display. Selecting this option designates a waypoint/OAP for weapon computations, sensor slaving,
steering, or position updating. Selecting the NAVDSG option designates the waypoint/OAP. After
designating a waypoint, the NAVDSG option is removed and TGT replaces WYPT. After designating
an OAP, OAP remains boxed and O/S replaces NAVDSG. When O/S is selected, the offset point is
designated, TGT replaces OAP, and O/S is removed.
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24.1.3.12 SEQ # Option (HSI Format). The SEQ # option is located along the right side of the HSI
display. At power up with WonW, this option initializes to SEQ 1 (unboxed). Successive actuations of
the option toggles through a display sequence in the following order: SEQ 1 (boxed), SEQ 2 (unboxed),
SEQ 2 (boxed), SEQ 3, (unboxed), SEQ 3, (boxed), and back to SEQ 1 (unboxed). With the SEQ #
　
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