TM 1-1510-218-10
3B-42
When operating direct to a
waypoint,
(DIR)
and
the
waypoint
identifier
are
displayed.
DIS –
Distance
to
the
active
waypoint in nautical miles.
ETE –
Estimated time en route to the
active waypoint in hours and
minutes. This value is based
on the present calculated
groundspeed, assuming that
the actual track is equal to the
bearing to the waypoint.
GS –
Groundspeed in knots.
TAS: –
The colon (:), when displayed,
indicates this is an enterable
data field, only when there is
no
true
airspeed
source
available. A true airspeed
may be manually entered so
that the system can make a
wind calculation.
WIND –
The computed wind using the
TAS. Displayed in degrees
true and knots. This field will
display
dashes
if
the
computed wind is less than 10
knots.
DTK –
Desired track. The great
circle course in degrees along
the active leg of the flight
plan.
TK –
Actual track. The track the
aircraft is flying over the
ground.
BRG –
The bearing from the aircraft's
present position to the active
waypoint.
DA –
The drift angle left or right in
degrees. If the aircraft's
actual track over the ground is
to the right of the aircraft's
heading a right (R) drift angle
is indicated. If the track is to
the
left
of
the
aircraft's
heading a left (L) drift angle is
indicated.
POS –
The aircraft's present position
displayed
in
terms
of
a
navaid, and the radial from it.
Another navaid identifier may
be manually inputted and the
present
position
will
be
referenced to that facility. If
the
navaid
is
manually
changed,
the
system
will
resume
automatic
navaid
selection for this field in
approximately 1 minute.
(17) Nav 2 Page.
LEG –
Varies somewhat depending
on whether the method of
operation
is
OBS
or
AUTO/LEG.
ACT –
This column header indicates
that data in this column is pilot
selectable.
L XTK: R –
The data to the left side of
XTK: is the actual cross track
error, which is the lateral
displacement of the aircraft in
nautical miles left or right of
the desired track. If parallel
track operation is desired, the
selected cross track may be
entered to the right of the
XTK: field. The selected
cross track distance provides
steering to a left or right offset
course parallel to the desired
track.
REF MAG –
The data to the left of REF is
the actual magnetic variation
in degrees computed for the
present
position
of
the
aircraft. The data to the right
of
REF
is
the
system
compass mode. BGR, DTKM
HDG, and TK are referenced
with respect to the displayed
system compass mode.
VNAV –
The VNAV field and the
associated VNAV lines below
it are displayed only when the
system
is
configured
for
manual
VNAV
operation.
When present, the pilot can
initiate
a
manual
VNAV
system
configuration
by
entering
data
into
the
appropriate data fields.
ALT: –
The data to the left of ALT: is
the actual present aircraft
altitude. The pilot may enter
a selected altitude in the data
