Step 10: PocketFinder
This 3G/Cellular tracker is called the PocketFinder. It's a small Oreo™ shaped object that transmits its position to http://www.pocketfinder.com You'll want ro order it with 2 months free tracking. This is pretty beneficial. The instructions are pretty simple, but make sure you have it working before you put it in the balloon.
The PocketFinder is pretty accurate as you can see from the image below. This is a screenshot on my iPhone from the actual place where we found the payload in a 60 foot tall tree. The parachute and radar reflector are still stuck there, so if you want to go get it for me, that would be great. Just kidding.