In recognition of World Maritime Day, celebrated in the U.S. on Oct. 16, we're joined by the director of NOAA's Coast Survey to talk about nautical charts and the maritime transportation system. Want to know what nautical charts have to do with Thomas Jefferson, mine sweepers, and the stuff you buy in a big box store? Just how big are some of the ships plying our waterways these days? What effect might rising sea levels have on the future of shipping? Find out in this special edition of Making Waves.