Course Deviation Indicator (CDI) and Distance Off Track
The triangle symbol (
“
) referenced to a bar graph shows your position relative to being
on-course. When the bar graph is to the right of the triangle, you must fly right to return
on-course; the bar graph indicates you are off-course to the left. Fly the aircraft in the
direction of the bar graph to return on-course.
ete aSLE 00:37
####
“ 4.005
Brg 173 42.4nm
CDI Sensitivity = 0.3 nm
CDI Sensitivity = 1.0 nm
CDI Sensitivity = 5.0 nm
each
7
= 0.01 nm
each
$
= 0.05 nm
each
H
= 0.24 nm
each
6
= 0.04 nm
each
z
= 0.14 nm
each
B
= 0.71 nm
“
›››››››
(full scale) = 0.3 nm
“
¼¼¼¼¼¼¼
(full scale) = 1.0 nm
“
¥¥¥¥¥¥¥
(full scale) = 5.0 nm
A single dot thickness bar indicates that CDI sensitivity is set to 0.3 nm full scale per side.
The two dot bar indicates a sensitivity of 1.0 nm full scale per side. The three dot bar
indicates a sensitivity of 5.0 nm full scale per side. The manual sensitivity of the CDI may
be set to 0.3, 1.0, or 5.0 nm full scale per side. The triangle symbol is also used as a
TO-FROM indicator. When the triangle is facing up, you are on the “TO” side of the
destination waypoint. When the triangle is facing upside down, you are on the “FROM”
side of the destination waypoint.
The number shown on the edge of the display opposite from the triangle symbol shows
the distance off track. The numbered values of Cross Track Error are in the direction you
are off course. If the numbers are on the left side, fly right to return on course. The
displayed value ranges are: 0.000 to 0.999 nm with 0.001 nm resolution, 1.0 to 9.99 nm
with 0.01 nm resolution, and 10.0 to 99.9 nm with 0.1 nm resolution.
ete aSLE 00:37
0.006
“
Brg 173 42.4nm
If the GPS sensor is not sending a valid position, or the current TO waypoint is blank, the
CDI will display “—Nav Flagged—”.
Navigation Basics
6
