GPS is a highly advanced network of satellites and mobile receivers that communicates with and tracks the movements of the majority of societies mobile phones and vehicles. It is also responsible for the identification of terrorist networks, and telling drivers where traffic is heaviest. The technology is so advanced it can replace the sun, a compass and a map.
The airline system breaks down. This causes mass layoffs in the airline industry which leads to mass poverty while the people normally flying are forced to travel by automobiles and trains. Which leads to a large rise in CO_2 emissions increasing the rate of climate change ending the world.