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Yes, absolutely. A decade ago Bill Premerlani made an ingenious recognition that a change of attitude relative to a change of groundspeed reveals the hidden airspeed state. Very briefly, here is the driving equation. (I refer the reader to the below documents for a full explanation of the variables). The DIYDrones link where B. Premerlani announces his work:...


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Could somebody explain a little bit why they need 2 separate GPS and 2 separate IRS? Because airliners falling out of the sky or disappearing without a trace is not acceptable from either a political or financial standpoint. Stuff fails and so backups are needed to keep the flight on-track when it does. Having two systems of each type makes it easier to ...


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Earth's magnetic field is not symmetric north to south. In particular, the magnetic declination can get significantly larger at a given southern latitude than it does at the corresponding northern latitude. This can be seen by looking at a world declination map: Curves of a given declination reach much lower southern latitudes than they do northern ...


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