Re:The device... (Score 2)

will remain dormant most of the time. It will only be activated by the wearer or by commands from the ground station.

Does anyone see a problem with this? One Possibility:

I'm going on a trip to another country. I arrive at the airport and check my bags and have my implant scanned. I proceed to board the plane and the airline (via a 'ground station' near the airport) deactivates my implant for the trip. This leaves two alternatives:

1) The plane crashes somewhere, but the device is totally worthless for finding us because it is off.

2) If we arrive on time, a ground station controlled by that country's government switches on so that they can watch everything we do.

Also, what is stopping them from giving businesses access to the ground stations?

Now they can log where we shop, and give us more targetted advertising...
"I never shopped their, but this 50% off offer looks good."
Then when the store you usually shop at sees that you aren't shopping their they send you their own coupons/advertising/other gimicks.

Anyone care to join me in founding a new civilization on the moon?