Global warming is opening summer sea lanes through the ice, along the north-west passage sought by Martin Frobisher and the North-East one sought by Hugh Willoughby.
沿着马丁·弗罗比舍发现的西北通道和休·威洛比探索的东北通道，全球变暖正在为北冰洋开辟夏季海上通道。
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Horizontal gyro drift is measured in state of azimuthal alignment by the two localization laws of the three directions of north, west and up, as well as east, north and up.