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How accurate is the accuracy of CLLocation?

I would like to use reliable places, even on an old iphone. However, many indications (in particular, cell towers) are too inaccurate. I think.

When I draw my position + radius of accuracy (or look at the Google Maps application), I notice that the center of the estimated circle is usually close to my physical location. I assume that if I reduce the number of "accuracy" in half, I will still be in the circle 99% of the time.

I think this is a probabilistic game - the location manager is trying to give an estimate that will fix 99.99999% of the time, so they give an intentionally wide margin. Any thoughts / information?

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CoreLocation CLLocation, , horizontalAccuracy/verticalAccuracy. CLLocationManager targetAccuracy, :

kCLLocationAccuracyNearestTenMeters, kCLLocationAccuracyHundredMeters, kCLLocationAccuracyKilometer, kCLLocationAccuracyThreeKilometers;

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