Ocean Currents Map
Although a map of Ocean Currents is extremely simple and straightforward, it has major impacts and influences throughout history as well as our international economy today.
In the past merchants and explorers were keen on ocean currents and trade winds in order to travel safe and efficiently. Understanding and utilizing ocean currents have allowed us to map almost every corner of the earth. Today ninety-percent of international trade is conducted through sea. Ignoring the logistical advantage of ocean currents would decrease global trade revenue across the board.
So I assume the gray lines are winds?
or indicators of gyres.. I guess