全国地形测量局的地图坐标标示某地的位置精确到100米以内。

An Ordnance Survey grid reference gives the position of a place to within 100 metres.

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虽然她皓首穷经地埋首于英国四十万分之一比例尺的全国地形测量地图，追寻每一条等高线，对她的研究目标来说，她仍觉得这份地图算是「粗糙的工具」。

Though she spent much of the time with her nose in one-inch Ordnance Survey maps, tracking the contour lines, she found them a “coarse instrument” for her purpose.

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