The dime-sized tracking devices that movie spies stick on villains’  cars don’t exist (that we know of). But there are some fairly small  options for keeping tabs on your closest enemies.
1. Lightning GPS Spark Nano
Not much bigger than a Zippo,  the Spark determines its position via cell towers. Just tuck it into  something you need to track and follow along on the intuitive web client  that updates in real time or at set intervals. Even with 30-second  updates and stashed in a backpack inside a car, the Spark was fast and  sensitive enough to show us the moment our significant other (a willing  participant) missed a turn on her way home.  
WIRED  Push notifications warn if the Spark crosses one of the Geo Fences (no-go zones) you’ve designated. 
TIRED Must export data for replay. Kinda creepy. 
$150, plus $70 activation fee and contract (starting at $210 for three months), lightninggps.com
2. iTrail GPS Passive Logger
This unit ditches the onboard transmitter and instead records  location data for download once you retrieve the device. While that  means no real-time monitoring, the upside is a tiny form factor about  the size of a tea bag—truly concealable. The Logger returned the finest  location accuracy of the bunch, and the Google Earth-based software was the easiest and most entertaining to use. 
WIRED  No service plan required. Automatic pop-up info during replay details how much time was spent at each stop along the journey. 
TIRED After-the-fact info means no catching people  in the act or recovering your stolen luggage. Retrieval is just another  chance to get caught. No Mac compatibility. 
$190, myitrail.com
3. Livewire FastTrac
Another cell-based solution, the FastTrac is nearly twice the size of  the Spark but adds a motion sensor and double the standby time (10  days). Web-based software offers replay and address lookup, so you’ll  know if 450 Elm Street is a shoe store, a café, or something else  altogether. Need to communicate with someone you’re tracking? Skype  integration makes it easy. No-button operation is idiot-proof, but this  is a lot of power to put in the hands of an idiot. 
WIRED  No contract required. SMS alerts when unit  exceeds a set speed, so you’ll know if the parking guys have taken your  dad’s Ferrari out for a spin. 
TIRED Expensive. Very creepy. 
$400, plus $25 activation fee and $39.95/month, brickhousesecurity.com
Buggin’ Out
Think somebody’s watching you? The Brickhouse Security Cell Phone  & Gps Detector ($295) will tell you if you’re crazy—or drive you  there itself. The walkie-talkie-sized widget detects signals from GPS  trackers and listening devices. This would be helpful, or at least  entertaining, if cell phones didn’t often emit the same signals. Is it  alerting you to a bug in your apartment or just your neighbor’s HTC Incredible?  But if you can eliminate the known devices, it will indeed spot  uninvited broadcasting. A quick scan of the cabin could add muscle to  airline requests to shut off cell phones. But it’s of little use to  people whose biggest privacy concerns are their Facebook settings (most  of us).—J.H.


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