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The primary navigation page, the HSI Page, also provides graphic steering guid-
ance to your destination. The graphic HSI depicts the desired course to the destination
waypoint (or the next waypoint in a route), current track, off course error and a
TO/FROM indication. The rotating compass card indicates your current track, at the
top of the page. The desired course pointer and CDI indicate the desired course and
whether or not you’re on the desired course. A bug indicator provides course to steer
(CTS) information, guiding you back to the desired course should you stray off course.
The CDI is indicated by a course deviation scale (across the center of the HSI) and
a moving D-bar (course deviation bar). If you move off course, the D-bar will indicate
how far off course you are, based upon its placement along the course deviation scale.
To get back on course and center the D-bar, simply steer toward the D-bar. The CDI
scale setting is adjustable for 0.25, 1.25 or 5.0 (nautical mile/ statute mile/kilometer).
The default setting is 1.25, which represents the distance from the center of the CDI
to full left or right limits.
To change the CDI scale, use the IN/OUT zoom keys.
As you reach your destination, a TO/FROM indicator at the center of the HSI will
indicate waypoint passage. Along the right-hand side of the page (top, when display
is vertical) are four user-selectable data fields that display current speed, distance and
time to next waypoint, and vertical speed to target (a vertical navigation function,
described on page 43). These data fields may be configured to display different data.
This example shows the air-
craft heading parallel to the
desired course, with the air-
craft right of course more
than 0.5 nm.
When off course beyond the
limits of the CDI scale, the
D-bar will appear in gray
and stay at the edge of the
scale (until your off course
error is less than the limits of
the scale).
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REFERENCE
HSI Page
Desired Course
Pointer
D-bar
(part of CDI)
Compass Card
(Track)
TO/FROM
Indicator
CDI Scale Setting
Bug Indicator
GPS III Pilot B2 4/1/99 2:02 PM Page 40