The speed at which GPS largely took the navigation job from paper maps for so many shows how useful people find being told nicely where to go.

But GPS has significant limitations. Not only is it sometimes wildly inaccurate (signals can bounce around, giving inaccurate readings), but it's not useful inside a building. The satellite signals coming in from geostationary orbit are weak and not effective at penetrating physical structures.

Radisys Corporation has announced Radisys ReachPoint, which a company press release describes as "a smart network-based geolocation platform that allows Mobile Network Operators (MNOs) to deliver real-time geolocation service capable of reaching places where GPS may not be available, such as inside tall buildings."

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