I used to work with a guy who was paranoid that phones could be used to locate a caller. I tried to explain to him how much this could help him if he ever needed to call 911 but he was dead set on the idea that some guy in a dark room is going to be tracking his every move. Granted, he thinks we didn't land on the moon, but does anyone really think that resources are going to be spent to track the location of every cell phone user? I can just visualize my log now:

7:30 "Brad left home for work."
11:30 "Brad left work to get some Subway." (Go through trash can to see what he ordered)
12:15 "Brad returns to work."
17:00 "Brad heads home."

I know I'm a bit off topic, GPS satellites transmit, they don't receive, but I think these misunderstandings can lead to paranoia about technology.