Studying the Ming Dynasty? Here's a nine minute clip from Engineering an Empire about the treasure fleet of Admiral Zheng He along with a longer documentary.
Asia for Educators also has good resources for Zheng He. They have a section that outlines the Admiral's seven voyages. I copied that section and printed it out for students and gave them an outline map of Afro Eurasia and had students trace the routes.
Finally here's an excellent colorful map from National Geographic showing the voyages.