Accuracy of the GPS

I'm analyzing the accuracy of geotagged photos using the iPhone 3G. After taking a picture, it looks like the latitude and longitude fields in the EXIF only store up to 1/100th precision.
For example, a typical lat/lon entry in the EXIF might be:
lat: 47 deg 38.56000'
lon: 122 deg 8.49000'
Has anyone ever seen a lat/lon entry with more precision, on a photo taken from an iPhone?
Another issue is that I have no idea whether the iPhone is using cell-tower triangulation, a GPS fix, (or wifi??) to obtain the location. Depending on the source for obtaining a lat/lon fix, I may get better (or worse) accuracy. Does anyone know how to tell what the iPhone is using for location when it geotags the photo?
Thanks!

http://itunes.apple.com/us/app/motionx-gps-lite/id293935935?mt=8
http://itunes.apple.com/us/app/handy-gps-and-compass/id319244349?mt=8

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