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I'm following BA0213 from LHR-BOS as my wife is onboard and coming over for Xmas. Just noticed this unusual and strange flight pattern just off the British coastline.

Any idea why this would occur? BA0213 - Dec 16th 2016

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    Santa was causing problems! – Karlson Dec 16 '16 at 13:56
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    GPS to website transfer was interrupted, the computer predicted for a bit a standard flight path, and then the GPS data came back. The plane obviously never flew that zig-zag, just straight through. – Aganju Dec 16 '16 at 14:04
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    This belongs on aviation.stackexchange.com, not travel. – Doc Dec 16 '16 at 16:13
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    You will have 6,378,000 people out for your blood if you don't edit your second sentence sharpish! – TonyK Dec 16 '16 at 18:38
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    @TonyK Technically, it is part of the British Isles, though. – reirab Dec 16 '16 at 23:19
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Don't rely on flight trackers, especially over the Atlantic, as they often have glitches which do not reflect the actual progress of the aircraft - its pretty much guaranteed that the aircraft did nothing more than fly straight and level during the supposed course change shown.

This isnt always the case, as aircraft can be asked to do a 360 degree turn to correct any spacing issues between them and the aircraft in-front of them. This may be the case in this particular flight, with the flight tracker recording that oddly from the ADS-B signals.

Its also worth noting that ADS-B receivers are extremely sparse over oceans, so after a certain point trackers solely rely on path prediction.

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    Did you mean 360? – phoog Dec 16 '16 at 14:09
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    @phoog circles are bigger here in the UK to account for the post-Brexit collapse in circle values.... – Moo Dec 16 '16 at 14:10
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    Oh dear. I thought the extra 20 degrees was attributable to global warming! – phoog Dec 16 '16 at 14:13
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    One thing I just don't understand: are you saying no civilian outside the airplane (or possibly even inside) knows where the airplane actually is whenever this odd stuff is occurring? Is the airline just entirely clueless and hoping for the best? This sounds kind of absurd to me, so I don't believe it's the case. But if not, then why can't normal people get access to the same positioning information that the "important" people get? Is there some kind of security risk or something? What's the benefit of showing people crappy information when good information already exist? – Mehrdad Dec 17 '16 at 7:49
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    @Mehrdad one word - MH370. In pretty much all cases, no the airline doesnt know precisely where the aircraft is at any point in time. That may change in the future however. Everyone relies on ADB-S data, which when over land is pretty accurate as the density of ADB-S receivers is high (you can buy one for a few hundred dollars and collect aircraft broadcasts yourself). – Moo Dec 17 '16 at 7:53
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If it helps, FlightAware has something a little less "irregular" (turbulence perhaps?):

TSE84462 example

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    They all use the same ADB-S data, so if that is interrupted for a moment or garbled, then all flight trackers will show a glitch - different trackers will just show it in different ways, down to the error correction and prediction routines they individually use. – Moo Dec 16 '16 at 14:18
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    Do you mean "is it a standard North Atlantic Track route", and the answer is "yes, certainly looks that way." If you are asking "does the flight path correspond to a route as would be laid out by the shortest route between two points on a sphere" then the answer is also yes, with the proviso that the route would be slotted into a standard NA track, which means its probably not the shortest but the best for the weather conditions at this moment in time without deviating too much from a great circle route. – Moo Dec 16 '16 at 14:24
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    No, there is absolutely no way to know that without detailed data from the aircraft itself, which we will never get. But glitches over oceans is a well known issue with flight trackers, so I would put money on it being a glitch rather than the aircraft deviating in such a minor manner - deviations arent done for a minor reason, so if it were going to hit something then we would already have ATC recordings being posted of the event (yup, some people and sites are that quick) and if it were a spacing issue then they would be told to slow down for 30 minutes for that a minor amount. – Moo Dec 16 '16 at 14:33
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    Its also worth noting @pnuts that on FlightAware, the dashed line is the planned route, while the solid line is the actual route flown according to the ADB-S data - uk.flightaware.com/about/faq#mapPlot – Moo Dec 16 '16 at 14:46
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    @hums I've flown deviations much bigger than what's shown here before. However, the path shown in the question is almost certainly just bogus reports from inaccurate ADS-B. Airplanes, especially airliners, are not capable of making turns that sharp. The turn radius for an airliner at cruise speed is several miles. – reirab Dec 16 '16 at 23:18

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