The Global Positioning System, a satellite-based system which provides exact location information to any equipment with a suitable receiver (including modern smartphones). GPS is invaluable to many location-based apps, providing users with e.g. route-finding information or weather forecasts based on their current location. GPS is also a striking example of successful open data, as it is maintained by the US government and provided free of charge to anyone with a GPS receiver.

Source: ODH

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