My earlier article Don’t Use QR Codes on Tombstones! at https://blog.eogn.com/2015/12/31/dont-use-qr-codes-on-tombstones/ about defacing tombstones by attaching new objects with adhesives has generated a lot of comments about one thing I didn't expect: the use of GPS (Global Positioning System satellite navigation system) in a cell phone to determine the location of a tombstone. Some of the comments questioned the accuracy of cell phone devices; so, I decided to write a separate article to address those questions. I will divide this into three different points in time: what the cell phone accuracy was a few years ago, what it is today, and it what it might become in the near future.
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