Is your in-car Sat Nav set to wither and die?
I've yet to sit in a car with a driver aided by GPS, and reach a destination any quicker than I would if I'd used a map. There's always some troublesome problem with the directions given, or a conflict of personalities between the small black box and the person behind the wheel. Or it can't establish a satellite lock. Or the batteries die.
Fortunately I've only ever followed directions off the back of an envelope or a printout of Google Maps, so I won't be first against the wall when the revolution comes. Because the technology could be about to fail catastrophically; the GPS satellites that are operated by the US Air Force are thought to be on the brink of breaking down, and that could happen as early as next year.
The US government accountability office (GAO) says that although over £1 billion has been spent so far on updating the 20 year old technology, delays and overspending means there's a danger of regular blackouts, system failures or providing inaccurate information to GPS systems. Technical issues and problems with contractors mean the first of several replacement satellites won't be launched until the end of the year - nearly three years late.
Obviously having GPS fall over not only threatens in-car navigation but every other household product that is becoming increasingly dependent on the data - including smartphones. Then we'd have to find another use for our complex handsets packed with technology. Like making phone calls, for example.