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Rare separately published sailing chart of the English Channel, published by the French Royal mapmaker Jean Beaurain in 1760.

The map is ringed with various scientific objects and diagrams, including:

  • The offshore and tidal currents and their visual representation on the chart with arrows.
  • Ancient and modern nautical logs (used to approximate the speed of a vessel over water).
  • The use of the mariner's crosstaff (l'Arbalestre) for measuring the altitude of the sun.
  • The ship's wake or 'sillage'.
  • The sounding lead (la sonde) for measuring water depth and the composition of the sea floor.
  • The planisphere and a description of the earth's rotation.
  • A simple astrolabe.
  • The compass and compass card. 

This is the first edition of the map.  The second edition, issued in 1778, is far more common.