Probably a good idea to have a GPS, global positioning satellite.

带上GPS（全球定位卫星）可能是个好主意。

So they’re used in devices that find underground oil and mineral deposits, and they also make highly accurate atomic clocks, like the ones used in global positioning satellites.

因此， 它们被用于寻找地下石油和矿藏的设备，它们还制造高精度的原子钟，例如全球定位卫星中使用的原子钟。