He then used GPS tracking technology similar to an in-car sat-nav to follow its progress.

而后，他使用类似于车内卫星导航的GPS跟踪技术跟踪整个拍摄过程。

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Now, GPS devices are far more common - and people carry around their own self-tracking technology in their cell phones.

现在GPS装置已经相当普遍了，人们将这种自我追踪技术安装到他们的手机了。

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Proponents of the technology say GPS tracking is analogous to the low-tech police tactic of trailing a suspect's vehicle.

技术派认为，GPS与警察用来跟踪嫌疑人的其他技术含量较低的手段差不多。

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Each balloon is fitted with the latest meteorological technology and GPS tracking systems which allow progress to be tracked online.

BBC: David Hempleman-Adams' gas balloon 'flying well' in race

The Justice Department recommended that prosecutors obtain search warrants when tracking phones using such "precise" technology as GPS or multiple cellphone towers, according to documents dated in 2007 obtained by the American Civil Liberties Union in a freedom-of-information request.

WSJ: Judges Challenge Phone Location Tracking