Horizontal situation indicator (HSI) is a flight navigation instrument that combines the heading indicator with a CDI (course deviation indicator), in order to provide the pilot with better situational awareness of location with respect to the course line.
1. Primary Navigation Source Annunciation,
2. Ground Speed Readout,
3. Selected Heading Readout,
4. Bearing Pointer,
5. Course Selected Pointer,
6. Heading Readout,
7. Lateral Deviation Indicator,
8. Drift Angle Bus,
9. Wind Display,
10. Course Select Readout,
11. Chronometer Readout,
12. Lateral Deviation Dots,
13. Secondary Radio Tuning,
14. Bearing Source Annunciation,
15. Selected Heading Bug,
16. Preview navigation Source Annunciation,
17. Heading Source Annunciation,
18. Course select preview Pointer,
19. Desired Track Readout,
20. DME Data Block,
21. RNP (required navigation performance) Data Block Indication,
22. MCDU (multi functional control unit) Annunciation,
23. Approach Sensitivity mode Annunciation,
24. FMS Lateral Deviation Annunciation,
25. Desired Track Pointer,
26. Way Point Data Block Indication,
27. Selected Heading Out Of View Arrow.
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