But it has now decided to reposition the technology as a voice-based navigation system for mobile phones.

但Promptu公司现又决定把这项技术重新定位成一种应用于手机的声控遥控导航系统。

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GPS, or global positioning system, is a satellite-based navigation system made up of a network of 24 satellites.

或者说全球定位系统，是一种基于24颗卫星网络的卫星导航系统。

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Objective To evaluate the feasibility and accuracy of cervical pedicle screw fixation when assisted by CT-based navigation system.

目的探讨计算机CT三维导航系统辅助下进行颈椎椎弓根螺钉内固定的可行性和置钉精确性。

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With the introduction of iOS 6 for both new and existing iPhone models, Apple is replacing the current Google-based navigation system it hosts on the phone with its own new location and navigation software, called Maps.

FORBES: Apple iPhone 5 Forecast To Drive Second Half 2012 Smartphone Shipments To 346.5 Million

The report also lauds the land-based eLoran radio navigation system as a very worthy back-up technology.

BBC: UK 'over-reliant' on GPS signals, engineers warn

Each probe can pick up GPS signals and signals from eLoran, an enhanced version of Loran, the ground-based terrestrial radio-navigation system first used by the American and British navies during the second world war.

ECONOMIST: GPS jamming