New official Apple warning calls for immediate action on older devices. Mostly iPhone 5 and earlier, iPad 4, and earlier models. Users on these devices must enter into your settings and update software to the latest versions available until 3 November. For some of these devices will be iOS 9.3.6, for other iOS 10.3.4, depending on their age.
Any device that is not updated until the deadline on 3 November, can expect problems with the GPS location, as well as potential problems with their exact date and time. The latter, in turn, may prevent the Apple gadgets such as the ipad pos app to receive further updates over the wireless network and synchronized with some online services, such as iCloud and mail servers. After November 3 will require a tethered update through iTunes to get them back to normal operation.
Before you write comments about the poor performance of Apple software, it is necessary to understand what is really going on here. This issue is far larger than Apple’s own domain, and can actually affect any device with support for GPS, which essentially is a mini error – GPS Y2K.
The point is that a GPS system to consider weeks using desyatiletnego parameter. This means that they start counting it from zero weeks and discharged when they reach 1024 weeks. The first calculation (or “GPS epoch”) began on 6 January 1980, and the first reset occurred on 21 August 1999. This means that the next count to take place on 6 April this year.
When there is a rollover, the old device can reset the date, which may cause damage to the navigation data and the loss of the position estimation. GPS uses precise temporal data to work with, and each nanosecond countdown translates into the error in determining location.
All this is why some compare the problem with a kind of a mini Millennium or Y2K Bug for GPS receivers, which will come into force from 6 April this year. This was also caused by the problem of transfer of numbers , as many early programs were recorded, with a two-digit code (“78” for “1978”, etc.), Which is reset when the clock reaches the year 2000.
However, it should be noted that only due to the fact that the next reset of the GPS week is scheduled for April 6, factual errors may appear later. According to the company Spirent involved in the testing of telecommunications, in his blog, some devices could restart the counter weeks, for example, when the manufacturer has compiled the firmware. Apparently, this was the case with Apple, and hence their precise calculation and the period 3 Nov.