Find out how early explorers navigated the seas using nothing more than the North Star, the Southern Cross, a magnetic needle, a clock, and the sun at high noon. The presentation features Captain James Cook's 1778 search of the Alaska coastline, hoping to find the Northwest Passage. Presenter Dean Knapp is a search and rescue volunteer who still uses latitude and longitude to direct rescue helicopters in the Alaska wilderness. Part of Eagle River Nature Center's Astronomy Series on the first Friday evening of each month from October through March. FREE, $5 parking. ERNC.org.