This is a nice one to share. Wondering where his cat was hanging out when he was away for several days, this guy (Mark Spezio) decided to attach a tracking device to his cat. The IEEE made a nice audio commented photo/video report of it:
Now he isn't using BT747 - if he were he could reduce the side effect of these large spikes on his track. And as far as the device is concerned, I couldn't make out which one he is using. Hints welcome.