Inaccurate GPS location

I find that the location of my address shown on the iPhone map is very inaccurate, being about 200 m off. I am concerned that this may be a general inaccuracy also affecting all other addresses. In a city, on a golf course, etc., 200 m can be a big deal.
Any others out there having the same problem
Is there any way to calibrate the accuracy?
Any advise?
Thanks.

Julian Solomons wrote:
This could be a stupid question, but are you are using the phone indoors? It will be inaccurate unless the GPS can get a "clear" fix from a satellite - and that is outdoors.
Takes more than "a" satellite; need at least four.
My iPhone and iPad both show my location accurately when I'm indoors, in some locations. The uncertainty circle should show how much error there is.
Another issue (especially indoors) is that it is "augmented" GPS, and uses cell tower and registered wi-fi location data to locate you. If it is connected to your wi-fi and thinks it's in another location, that will bias your location error.
Best way to test GPS performance is outdoors and without any wi-fi connection. Then it should locate you very accurately.
Phil

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