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It's my understanding that in 2008, the US government published GPS standards for civilian applications (including cellphones) of rms 4m.

  1. Is it correct that this applies to cellphones? and
  2. Has this 4m rms been improved since 2008?

http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf

What is the maximum Theoretical accuracy of GPS?

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    all depends on hardware the device is using. accuracy can get way better than 4m. If you mean the default standard GPS locators on a phone then that will depend on the model and the year the phone was built. – NULL.Dude Aug 7 '17 at 14:35
  • Do you have an estimate on a particular model, say the iphone 7 with a BCM4774 chip? I cannot find specific accuracy specs online. Thanks – user140531 Aug 7 '17 at 15:06
  • I have a Sony Xperia Z3 (released in 2015 I think) and it's ~ 5m – Gob Tron Aug 7 '17 at 20:49
  • I don't have straight answer to your question but I used geotagged photos tool in ArcMap to embed the photos from my cell phone in the map. I have recorded the same points with Trimble Juno 3B GPS. I have noticed Trimble nailed locations with very good accuracy while geotagged photos were not accurate and 4-5 m off. My phone was Samsung Galaxy Note 4. – Amadeus Aug 7 '17 at 21:44

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