Reading Maps: Reference Points on Earth

The video tutorial explains how mapmakers and navigators solve the problem of describing a location at sea by using imaginary lines on Earth. It introduces the equator and lines of latitude, which measure distance north or south of the equator, and lines of longitude, which measure distance east or west. The intersection of these lines forms a grid that helps pinpoint any location on Earth. The tutorial also discusses the Global Positioning System (GPS), which uses satellites to determine exact locations based on latitude and longitude, and highlights its usefulness for surveyors, hikers, and boaters.

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