Topic #4 concerns the understanding of a marine forecast. The link below will take you to the website co-sponsored by the National Weather Service and the National Safe Boating Council, which provides a full description of today's topic: http://www.nws.noaa.gov/os/marine/safeboating/tuesday.shtml (picture shown courtesy of LT Faith Knighton, showing rough conditions on the NOAA Ship OSCAR DYSON) (see our May 21 Facebook post)