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A comment on How the pilots of Lion Air Flight 610 lost control. Parent comment

Re:How the pilots of Lion Air Flight 610 lost control by FeliveNdrell on Thursday December 27, 2018 @01:34AM (#18767842)
Inertial Navigation System (INS) measures linear acceleration (via accelerometers), angular velocity (via gyros) and optionally magnetic heading. Using integration and filtering (Kalman or similar) you get aircraft velocity, position and attitude. Without constant correction (GPS for example) calculations based on INS measurements degrade over time (due to instrumental and calculation errors) but in range of minutes they are pretty accurate.

https://en.wikipedia.org/wiki/Inertial_navigation_system

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Re:How the pilots of Lion Air Flight 610 lost control by gugagore on Tuesday January 01, 2019 @10:33AM (#18800520)
The comment I was replying to implied that checking with the inertial measurement system was an alternative to checking against GPS.

I still think I'll be surprised if accelerometers provide useful velocity information over timescales useful to a pilot. But maybe that's because I only have experience with cheap MEMS accelerometers from around 15 years ago.

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