Just got this note below from Foreflight, who have tested and validated that this latest Apple software release fixes issues with 3rd party GPS receivers.
We are happy to report that the GPS accessory compatibility issue that resulted from the Apple iOS 8.3 update is resolved with the iOS 8.4 update released this morning. We have performed a quality review of the Bad Elf GPS Pro, Bad Elf GPS Pro+, Dual XGPS150, and Dual XGPS160 on a Wi-Fi iPad running iOS 8.4 and these devices perform as expected. Stratus 1 and Stratus 2 devices were not affected by this issue. We have also started our general ForeFlight Mobile compatibility testing of the final version of iOS 8.4.
While I do have an external GNSS receiver, I rarely use it because the iPad 4 onboard one works 99% successfully, avoiding the need for separately charging it up (or forgetting to remove it from the aircraft).
