DOWNLOAD THE FILES..THEN EXTRACT ALL.
IN OPENCPN SETTINGS(SPANNER) CHARTS,ADD THE FILE TO THE CHARTSETS..DO A FULL DATABSE REBUILD.
THEN ON THE TAB VECTOR CHARTS,TICK MARINERS STANDARD,AND TICK SELECT ALL TO GET ALL THE INDIVIDUAL CHARTPOINTS AVAILABLE.
WHEN YOU CENTRE OVER THE AREA,,ZOOM IN,,,,AND TICK ONE OF THE YELLOW OR GREEN CHART COLOURS,,,USUALLY TO THE RIGHT OF THE BLUE ONES,,,THEN ZOOM IN MORE TO SEE THE DETAIL BUILDING ON THE CHARTS,