If you want to know where you are, you need a good clock. For centuries sailors have used clocks to locate where they are out at sea. Today we use synchronized clocks and orbiting satellites for location. In this episode of STEM in 30, we take a look at the challenges of navigating at sea, in the sky, and even in space. Visit the full archived lesson with pictures and audience comments here.

Originally presented on August 26, 2015 | Explore the Support Materials below for the archived live-stream content with questions, comments, and images shared during the live event.