![navigation - What are the differences between an OBS, a CDI, a Heading indicator, and an HSI? - Aviation Stack Exchange navigation - What are the differences between an OBS, a CDI, a Heading indicator, and an HSI? - Aviation Stack Exchange](https://i.stack.imgur.com/6dhv3.jpg)
navigation - What are the differences between an OBS, a CDI, a Heading indicator, and an HSI? - Aviation Stack Exchange
The interpretation of the HSI (Horizontal Situation Indicator) on the ILS Bearing respectively heading of the aircraft OBS - Omn
![IRA knowledge test question - I don't understand how the HSI can show these aircraft north of the radial. : r/flying IRA knowledge test question - I don't understand how the HSI can show these aircraft north of the radial. : r/flying](https://i.redd.it/cxsim10s2pi81.jpg)
IRA knowledge test question - I don't understand how the HSI can show these aircraft north of the radial. : r/flying
![Horizontal Situation Indicator Explained | HSI Test Questions | How an HSI Works | Chase the Needle - YouTube Horizontal Situation Indicator Explained | HSI Test Questions | How an HSI Works | Chase the Needle - YouTube](https://i.ytimg.com/vi/p9FHfzJFnQk/maxresdefault.jpg)