The current claim is that this is a limitation of GPS in a phone, but inside information shows us the truth of this "limitation."
The real flash of truth here is that you can and will be arrested for the assassination of a political figure. Your arbitrary GPS radius placing you as closer to a crime scene than you actually were means that government spooks will easily be able to frame you when they look at the GPS info for who was nearby and decide that everything about your timing in the area makes you look guilty. It'll be easy to pick you up too since the GPS suddenly becomes more accurate when you are "fleeing."
Recommendation: Avoid phones like the iphone or Palm Pre.
-- Sent from my Palm Pre