Quoted: GPS tracking device direct from the manufacturer, including WorldTracker Pro, WorldTracker, and WorldTracker RF. Our GPS tracking devices use radio frequency, and GSM technology for covert car and vehicle tracking. Built in data logger and battery! Conduct covert surveillance covertly.

Quoted: GPS tracking products direct from the manufacturer, including WorldTracker Pro, WorldTracker, and WorldTracker RF. Our GPS tracking devices use radio frequency, and GSM technology for covert car and vehicle tracking. Built in data logger and battery! Conduct covert surveillance covertly.

Quoted: GPS tracking products direct from the manufacturer, including WorldTracker Pro, WorldTracker, and WorldTracker RF. Our GPS tracking devices use radio frequency, and GSM technology for covert car and vehicle tracking. Built in data logger and battery! Conduct covert surveillance covertly.

$389 + plans from $20-45/month with "usage units"

Quoted: The GemTrack GPS Child Locator enables parents learn the precise location of their children with a few Internet keystrokes or simply by placing a phone call. Great for Children 10 and older.

$600 + $90 activation. Appears there is a package with no monthly fee and also one at $60/month.

Quoted: Perfect for single day use, this tiny GPS Tracker is self-contained and small enough to fit in the palm of your hand.

$650 + $90 activation + $70/month

Quoted: Tiny battery operated GPS tracking device that can give you 15 second update intervals for over 6 hours! This is the best covert compact GPS tracking device available for short term tracking!

A bit clunky, $500 plus some monthly charge.

Quoted: This Real Time CDMA unit is distinctive from other Real time tracking system, 1st is its Very small fits in the palm of your hand easy to conceal on your person or in a vehicle the unit does not need to “see the sky” to work 2nd is that it works in location were other trackers won’t like inside buildings or parking garages. How does it do this? By using Cellular assist. Plans start as low as 19.95

This sounds great. $700 plus some unknown monthly charge.

Quoted: NEW gps! WorldTracker GPRS Extreme 15 Second Updates gps!, Self contained device fits in the palm of your hand gps. No external antennae needed, just plug and play. spy gear, gps tracking

I'm skeptical about this given the size.

Quoted: The worlds First Implantable GPS Tracker

The Bio-Trac GPS Tracker is so small it can be easily implanted under the skin quickly and easily with our included pain free light implant gun. For short term use the rice sized tracker can be swallowed like a pill and will stay in your system for up to 72 hours. Implant or swallow this tiny tracker and you or the trackee can be located anyplace on the planet. (Accurate to 5 feet even in buildings)