A cockpit instrument that combines a conventional heading indicator with navigation information (VOR, ILS, TACAN, GPS/INS). The HSI presents the aircraft’s heading and course in a single, intuitive display, making it easier for pilots to visualize their position and track relative to a selected course or navigation aid.
Key characteristics:
- Heading display: Shows current aircraft heading on a rotating compass card.
- Course selection: Allows the pilot to set a desired course (inbound or outbound radial) using a course selector knob.
- Deviation indication: A centered bar/needle shows whether the aircraft is left or right of the selected course.
- To/From indication: Displays whether the selected course leads to or from the station (for VOR/TACAN).
- Glideslope/Localizer integration (when used with ILS): Can show lateral (LOC) and sometimes vertical (GS) guidance for precision approaches.
Compared to older “needle” indicators, the HSI presents heading and course in a single, intuitive compass format, reducing pilot workload and improving situational awareness.
Application in DCS World
Many DCS aircraft (C-101, L-39, A-10C, F-5E, etc.) feature HSIs that display heading, course deviation, and navigation information (TACAN/VOR/ILS, depending on the module). This allows cadets to practice real IFR-style course tracking and intercepts.
Some simplifications exist: DCS does not always model all failure modes or subtle instrument errors (precession, certain flag conditions). Also, full civilian-style VOR networks are not implemented; TACAN is the primary equivalent.
Cadets should train using the HSI to:
- Intercept and track radials/courses (inbound and outbound)
- Fly ILS localizer courses and hold patterns
- Build a mental “moving map” of their position relative to beacons and waypoints
This makes the HSI a core instrument for both basic instrument training and advanced navigation in the Academy.