It seems iPhone (and iPad) actually has a standard feature that is called external GPS device?
I hope to find out more about it:
First of all, why would we use an external GPS device? I can understand if it is wireless-only iPad, then it has no GPS hardware and it is "best guessed by wireless", so an external GPS device can help, but what about for iPhone -- why do we need it?
If it is external GPS device, is it by BlueTooth only? Can it be by WiFi, or by lightning connector, USB-C if it is iPad Pro, or possibly, another other method? (such as using the Internet to pass the location to iPhone, instead of BlueTooth?)
Does it in general work for iPhone and iPad both?
So the device can also move around from the true GPS location, such as for whatever reason, simulate a location that is 20 feet away? Or even to 50 miles away? What are some examples of such devices?
The question is to understand about "external GPS devices", which I never knew is actually a standard feature for the iPhone / iPad.