They knew where they were going. Scientists are researching Marshall Islands sailors’ ability to navigate without instruments. For thousands of years, wave pilots relied on ocean patterns to sail the high seas. To keep the method alive, a trio of amateurs is having a go to prove they can take sailing canoes out of sight of shore, even at night, and still make landfall. Researchers hope their work will pave the way toward understanding how humans can steer free of a satellite-driven world … and set their own course.