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Elevations Shown on Nautical Charts
Heights of rocks, bridges, landmarks and lights are in feet and refer to Mean High Water. Contour and summit elevation values are in feet and refer to Mean Sea Level. See Chart No. 1 for more detail. This is a shoreline on a nautical chart.  Numerous rocks are shown.  The elevation of one rock is shown to be 6 feet above Mean High Water.  Note on chart says 'Elevations of rock, bridges, landmarks and lighters are in feet and refer to Mean High Water. Contour and summit elevation values are in feet and refer to Mean Sea Level.'

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