船头尺是指船头处涂划的刻度线，用以测量船只的排水量。
浪头现在约有五英尺高，船头上下颠簸。
The waves were about five feet high now, and the bow of the boat was leaping up and down.
例如，a scope of 7意味着当水深为17英尺，船头距水面为3英尺时(总共的垂直落差为20英尺)，140英尺的锚缆将被放出。
For example, a scope of 7 to 1 means that with a water depth of 17 feet and the boat's bow 3 feet above the water (total vertical drop of 20 feet), 140 feet of anchor rode would be let out.
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