Great Britain. Geological Survey of England and Wales. Great Britain. Ordnance Survey of England. Sheet 353 solid and drift. North Decimal Degree 50.3000. South Decimal Degree 50.1333. East Decimal Degree -4.5167. West Decimal Degree -4.9333. Relief shown by contour interval and spot heights.Transverse Mercator projection. National grid system. Depth is shown by contour interval. Inset: Eddystone Lighthouse. "Original Geological Survey on the one-inch scale, by Sir H.T. De la Beche. Published on Sheet 31 Old Series. Resurveyed on the six-inch scale by Clement Ried, F.R.S.".