Using an external GPS with an iPhone 4S

For improved accuracy, I want to use an external GPS with my iPhone 4S. I have purchases a Dual XGPS150A Bluetooth GPS receiver and successfully paired it with the iPhone. Dual's "GPS Status Tool" app reports the GPS data from the device just fine. So now I want to get other apps like MotionX to use the GPS data from the XGPS150A in preference to the iPhone's own GPS.
Dual's technical support assures me this can only be done by putting the iPhone in Airplane Mode then re-enabling Bluetooth. Well that's a showstopper. However, in another post here, I found this statement from BrettAtBadElph: "As long as you are using an Apple-approved external GPS accessory like the Bad Elf, XGPS150, or GNS, you don't have to worry about configuring the GPS source being used. The iOS device will pick the source with the best accuracy, and shut down the internal receiver to save power."
Is BrettAtBadElph correct? If so, can anyone point me to some documentation?

I've received no responses, nor have I found any difinitive info elsewhere. But I can say that testing this weekend has made it clear that that BradAtBadElph is correct -- MotionX is clearly using the XGPS150A GPS data in favor of the iPhone's native GPS.
Funny aside: Dual's GPS Status Tool app is fairly weak -- it cannot dissplay any GPS data if another GPS-consuming app like MotionX or Waze is in memory.

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I am not sure my original message was clear.
I have th Z10, it has GPS software and a built-in GPS radio receiver. I also have an external GPS radio receiver, not a GPS device. It is strictly a radio receiver. I used to use it years ago on my Windows Mobile device - the software with maps was on Windows Mobile, and the GPS receiver hooked up via Bluetooth.
The GPS receiver in the Z10 uses the Z10 battery. I have the Bluetooth on anyhow to connect to my helmet headset. Since Bluetooth is on already, I could save Z10 battery by using the external GPS radio receiver (disable the internal GPS radio receiver), thought the map software would still run on the Z10.
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I am not sure the statement was respect to my setup.
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