This is the BBC television program that I have referred to when discussing the typical home range of the British domestic cat. Update Dec 30th 2014: the BBC video has been deleted because of a copyright violation so I have substituted something very similar.
The cats wear a GPS (global positioning satellite) tracking device and video camera. They are all outside cats. The purpose is to find out what these outside/inside cats get up to when outside and at a time when the caretaker is not looking.
To be fair, it is quite instructive. Ruth (aka Kattaddorra) made a good point. She does not want to know in detail what her cats get up to when outside. It is their business.
They should have some privacy and be allowed to be themselves. I referred to this as being allowed to be their wild selves because when the domestic cat is outside, alone, they return to the wild cat roots. They can enter a world in which they are not dependent on humans for everything. That is good for them.
All we need to know is whether they are safe because that is our responsibility.