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For more information, see Update: iOS 8.4 Expected To Resolve GPS Accessory Compatibility Issue
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We have learned of an issue with Apple iOS 8.3 that affects some early model Bluetooth GPS accessories, such as the Dual GPS 150 and Bad Elf Pro. When used with iOS 8.3, position information from these accessories may not be delivered to iOS applications, including ForeFlight Mobile.
Stratus and Bad Elf Pro+ devices are not affected. Our friends at Bad Elf have escalated the issue to Apple for resolution.
As a workaround, customers with Wi-Fi + Cellular iPads who have upgraded to iOS 8.3 can disconnect their Bluetooth accessories and rely on the iPad’s internal GPS or Stratus. Customers with Wi-Fi only iPads who have upgraded to iOS 8.3 will need to wait for a resolution, upgrade to a newer GPS accessory, or connect to a Stratus.
We will keep you updated. If you rely on one of these early model Bluetooth GPS accessories, we do not recommend that you upgrade your Apple devices to iOS 8.3.