Wellicht iets minder geavanceerd maar o.a. bruikbaar voor hetzelfde soort doeleinden als de muntjes uit: LinkNotes: Spy Coins is deReally Cool Portable GPS Tracker
"The Portable GPS Tracker is pretty small so you could either always carry it on you or use it in 007 spy mode by planting it on a person or vehicle you want to monitor. You may be wondering how you retrieve the stored info and secret routes, well that’s where it gets really cool.
Once the tracker has done it’s travels and it’s back in your possession you simply connect it to you PC and download the data. This data can then be plotted on Google Earth, Mapquest, maps.google.com and Virtual Earth to show exactly where it’s been, how long it took and how it got there."
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