Throughout most of the history of the tsunami warning system, the warnings were based purely on the earthquake information-our best guess for the magnitude, location and depth.

纵观海啸预警系统的历史，其警报纯粹是建立在地震信息的基础之上，譬如对震级、位置和深度的估计。

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The satellite-based global-positioning system provides each vehicle with its location on the Earth’s surface, to within a few centimetres.

由卫星支持的全球定位系统为每一辆汽车提供它在地表上的位置，只有几厘米的误差。

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Apple's patent, however, describes a system where all of the devices in a specific location can automatically become part of a new social network based on their location.

但苹果的这项专利介绍了一种系统，所有位于特定地点的手机可以自动加入一个基于该地点的社交网络。

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Many of the winning applications had some kind of social networking feature, including Life360, a location-based system that, among other things, allows users to form social networks with others in their neighborhood.

CNN: Face to Facebook: social networks hit the streets

The government's Emergency Alert System has had just such a plan in the works for a while now, and Sprint Nextel is becoming the first national carrier to trial a system capable of sending targeted, location based alerts when bad stuff goes down.

ENGADGET: Sprint Nextel first national to test emergency alerts

Users can also create to do or reminder lists and the system can remind them at the right time based on location.

ENGADGET: Garmin K2 in-dash infotainment system brings a hint of glass cockpit to the road