Radar and GPS track the vessel's position and display it on the chart, along with the nearby sea traffic.

雷达和GPS会追踪到集装箱的位置并且将其并同附近的海路一起反应在航线图表上。

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NASA radar astronomers picked up its track on Friday and were immediately able to narrow its position to within one kilometer — 50 times better than their previous best estimate.

NASA的雷达天文学家周五发现了它的轨迹，并立即将它的位置精确至一公里以内的区域，比此前最好的估计精确了50倍。

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