Barriers to navigation such as: Seawall, breakwater, dyke, lighthouse, beacon, ferry dock, marina dock, pier/wharf, dry dock, beaver dam, flumes. Polygons replace symbols. TRIM-EBM is a 2D product containing TRIM 1 features excluding toponoymy, contours and DEM for which area based features have been closed to form polygons, symbol points have been replaced with polygons and vertical integration of streams has been removed.