They did not discuss if they had seen it before, but immediately went to applying the newest OS release. It seemed like a standard procedure to wipe/apply latest release for something beyond normal "How To" fixes.

Harry,
I worked with Apple Support and was able to resolve the issue.

I performed a full restore to wipe the phone and apply the latest iOS release. Steps taken:

1. Back up iPhone with iTunes
2. Disconnect iPhone from USB cable
3. Shut down iPhone
4. Hold down iPhone "Home" button
5. While holding ...

Harry,
Thank you for the quick reply. Use Accessories = ON. XGPS150A switch in Apple position (farthest away from USB jack). Closed all apps on iPhone, unpaired and paired Dual XGPS, then launched LapTimer, same result.

When turning off Accessories, I do get a GPS fix, but it does not go over 1 Hz ...

Thank you for any help. I am unable to get external GPS sensor data in LapTimer Grand Prix.

Here is what I am using:
* iPhone SE iOS 9.3.1 (13E238)
* Dual XGPS150A firmware 1.3.2
* Harry's LapTimer Grand Prix 20.0.3

What works
* Successfully connect iPhone to Dual XGPS via bluetooth
* Can see Dual ...