The horizontal situation indicator (commonly called the HSI) is an aircraft instrument normally mounted below the artificial horizon in place of a conventional directional gyro which combines both the DG and the VOR display and reduces pilot workload by lessening the number of elements in his or her scan. The HSI instrument also includes a glide slope needle so that an ILS can be flown with reference only to the six basic instruments. Among other advantages, the HSI offers freedom from the confusion of reverse sensing. Image:HSI.gif This is a copyrighted and/or trademarked logo. ... Image:HSI.gif This is a copyrighted and/or trademarked logo. ... Airbus A380 An aircraft is any machine capable of atmospheric flight. ... This article or section should be merged with Attitude indicator The term Artificial Horizon is used to describe devices that can indicate the position of the horizon when it is not possible to see the actual horizon. ... The heading indicator (or HI) is an instrument used in an aircraft to inform the pilot of his heading. ... DG may stand for: The IATA code for Eastern Pacific airline Dangerous Goods Dark Galaxy Data General (dg. ... In Norse Mythology Vor is a goddess of the Aesir. ... ILS can refer to any of the following: New Israeli sheqel, the currency of Israel. ...

On the HSI, your airplane appears in miniature in the center of the instrument. The VOR/ILS localizer is shown in relation to the miniature airplane. This is all on the face of the heading indicator slaved to a remote compass-a marriage of the heading indicator and VOR/ILS (with glide slope), which is frequently interconnected with an autopilot with altitude hold and the capability of following the glide slope all the way to the decision height and beyond. In Norse Mythology Vor is a goddess of the Aesir. ... ILS can refer to any of the following: New Israeli sheqel, the currency of Israel. ... In Norse Mythology Vor is a goddess of the Aesir. ... ILS can refer to any of the following: New Israeli sheqel, the currency of Israel. ... Glide ratio is an aviation term that refers to the distance an aircraft will move forward for any given amount of lost altitude (the cotangent of the downward angle). ... A simple detachable autopilot on a sailboat. ... Glide ratio is an aviation term that refers to the distance an aircraft will move forward for any given amount of lost altitude (the cotangent of the downward angle). ... Terminal procedures for an ILS approach. ...

On a conventional VOR indicator, left/right and to/from must be interpreted in the context of the selected course. When an HSI is tuned to a VOR station, left and right always mean left and right and TO/FROM is indicated by a simple needle pointing to the VOR. If the arrow points ahead of you, it means TO, and if it points behind you, it means FROM. In Norse Mythology Vor is a goddess of the Aesir. ... In Norse Mythology Vor is a goddess of the Aesir. ... In Norse Mythology Vor is a goddess of the Aesir. ...

See also

• Instrument flight rules (IFR)
• Instrument Landing System (ILS)
• Non-directional beacon (NDB)
• Distance Measuring Equipment (DME)
• Global Positioning System (GPS)

It has been suggested that Air traffic control#Instrument Flight Rules (IFR) be merged into this article or section. ... The Localizer station at Hanover/Langenhagen International Airport in Hanover, Germany. ... A non-directional beacon (NDB) is a radio broadcast station in a known location, used as an aviation or marine navigational aid. ... D-VOR/DME ground station Distance Measuring Equipment (DME) is a transponder-based radio navigation technology that measures distance by timing the propagation delay of UHF radio signals. ... GPS satellite in orbit, image courtesy NASA The Global Positioning System, usually called GPS, is the only fully-functional satellite navigation system. ...

External links

• Macromedia Flash 8 Based HSI Navigation Simulator
• Java-based HSI Navigation Simulator