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"It is dependent on good weather, neap tides and flight permits," Mr Mearns said.

The neap tide swept us southward, pulling us past the Cape.

The students then had to interpret the graph and answer questions like “On what range of days were there neap tides in this month?”

In crossing, I found a most rapid tide, at least five or six knots at neap tides, and to pull against it was out of the question.

It would not measure more than a league in length, but its breadth varied wonderfully, according as it was seen at high or low water, at spring tide or neap tide.