Isn't GPS a wonderful invention? In the space of a few seconds, your GPS enabled handset can give you your precise location on the face of the Earth, allowing mobile maps to work, routing and navigation to get you to where you want to be or earning you another Mayor badge on a well known location based social networking site.

Except when it doesn't ... you're in an urban canyon, you're deep in a building or underground where you just can't get a GPS lock and you stand there watching the "waiting for GPS" message to disappear. GPS lock fail rage.

Saturday Morning Breakfast Cereal seems to sum up the rage and frustration rather neatly. We've all been there ...