HORIZONTAL SITUATION INDICATOR
The Horizontal Situation Indicator (HSI) displays a rotating compass card in
a heading-up orientation. Letters indicate the cardinal points with numeric
labels every 30°. Major tick marks are at 10° intervals and minor tick marks
are at 5° intervals. A digital reading of the current heading appears on top
of the HSI, and the current track is represented on the HSI by a magenta
diamond. The HSI also presents turn rate, course deviation, bearing, and
navigation source information. The HSI is available in two formats, a 360°
compass rose and a 140° arc.
The 360° HSI contains a Course Deviation Indicator (CDI), with a Course
Pointer, To/From Indicator, and a sliding deviation bar and scale. The course
pointer is a single line arrow (GPS, VOR1, and LOC1) or a double line arrow
(VOR2 and LOC2) which points in the direction of the set course. The To/
From arrow rotates with the course pointer and is displayed when the active
NAVAID is received.
Figure 7-13 – Horizontal Situation Indicator (360˚ HSI)
1. Turn Rate Indicator
2. Current Track Indicator
3. To/From Indicator
4. Navigation Source
5. Aircraft Symbol
6. Course Deviation Indicator (CDI)
7. Rotating Compass Card
8. OBS Mode Active
9. Lateral Deviation Scale
10. Flight Phase
11. Course Pointer
12. Heading Bug
13. Turn Rate and Heading Trend
Vector
14. Current Heading
15. Lubber Line
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