Paragraph 7
In this Schedule–
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“low water line” means the line so marked on the Ordnance Survey maps on a scale of 1:25,000 in the edition for the areas to which they respectively relate last published prior to the date on which these Regulations are made, and any reference to a map reference point shall be construed as a reference to a point having that map reference on the National Grid for those Ordnance Survey maps; and “nautical miles” means international nautical miles of 1,852 metres.