Single sheet, hand coloured engraving. Prime meridian through Ferro. The text at top left reads: Note, that the arrows among the lines shew the course of those general and coasting winds, and that the arrows in the void spaces shew the course of the shifting trade winds, and the abbreviations, Sept. &c. shew the times of the year when such winds blow.
This chart, covering from 50 degrees north to 50 degrees south of the Equator, centres on the Pacific Ocean, 'The Great South Sea'. Wind directions are indicated by arrows and fine engraved lines. Magnetic variation is shown by isogonic lines at 5 degree intervals.