This looks like fun :/
A GPS weakness could allow hackers to remotely track smartphone users, or even completely take over mobile devices, University of Luxembourg researcher Ralf-Phillip Weinmann reported last night at Black Hat. Instead of directly using GPS satellites, most mobile devices receive much faster assisted GPS (A-GPS) signals from cellular networks to determine approximate location. However, Weinmann discovered that these A-GPS messages are transmitted over a non-secure internet link, and could be switched for messages from an attacker.
Weinmann demonstrated this vulnerability on several Android devices, and explained that a hacker could…
Read the rest at: http://www.theverge.com/2012/7/27/3193343/gps-vulnerability-hack-track-smartphones-black-hat