I have an iPhone. That iPhone has a GPS built in. So I blagged a free app called 'Tracker'
I then find a victim and ask them if they have their mobile phone with them and if so what's the number. I punch it in and low and behold Google Earth pinpoints their exact position in the world... Which of course it doesn't - it simply locates my GPS signal.
I've caught 7 people so far. Lots of concerned faces. Bwa ha ha ha ha ha
I Can See You!