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. The wind data was obtained from Dampier's voyages and the magnetic variation from Halley's 1700 survey.

For full functionality of this site it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser.

Your download will start shortly, please do not navigate away from this page until the download prompt has appeared. Doing so may cause your download to be interrupted.

'A view of ye general and coasting trade-winds, monsoons or ye shifting trade winds through ye world, variations... according to the newest and most exact observations'