Remove Instrument Landing System Remove Pitot Tube Remove VOR
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The Six Pack: Basic Flight Instruments

Pilot Institute

The Heading Indicator should not be confused with the Horizontal Situation Indicator (HSI), which is an evolution of the Heading Indicator that includes VHF Omnidirectional Range (VOR) and Instrument Landing System (ILS) indications. The pitot-static system consists of one or more pitot tubes and static ports.