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Navigational tools and methods of early voyagers provide the background and contrast to the satellite images and models used today. Students complete mapping activities based on historical data from Columbus and Blith. Students will also use a computer model of ocean currents to investigate the movement of objects drifting on the ocean surface. Note that this is lesson one of five on the Ocean Motion website. Each lesson investigates ocean surface circulation using satellite and model data and can be done independently. See Related URL's for links to the Ocean Motion Website which provide science background information, data resources, teacher material, student guides and a lesson matrix.