Could anyone please tell me if there exists a GPS tracking device that is light, small and safe (e.g., does not cause harmful radiation) and can be tracked back via say an app on a phone?
closed as not constructive by Polynomial, D.W., AviD♦ Nov 14 '12 at 10:40
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You can get a GPS device to be pretty small, but that's not all there is to it. You also need to transmit your GPS location. So that means some sort of communcation spec; Bluetooth, WiFi, or more likely cell phone.
OK, so you get your GPS module, a controller chip, and a cellular module. Now what? Perhaps you could send a text message every 5 minutes with your current location? Or perhaps connect via cellular Internet and ping a website somewhere with your current location. Either way, you need a cell plan, which means paying a monthly fee to your compatible carrier of choice.
Of course, it'd be simpler just to use an old cell phone.
Garmin currently makes a unit called the GTU 10. If you're willing to shell out some dough, you can buy this unit and get the free Garmin Tracker app on your smartphone. The app lets you set up geofences and maintains tracking history.
I've used this combination and found it to be fairly useful, but it can have trouble locating satellites indoors, near tall buildings, or in a dense forest.