HARBOUR ENTRANCE. Depths on the bar at the harbour entrance are subject to frequent change and it is dangerous for mariners without recent local knowledge to attempt to cross it.  Mariners should contact the Grey District Council by telephone or radio to ascertain the latest bar and harbour depths.  A Quick Flashing Blue light may be shown from the Flagstaff on the South breakwater to warn that the bar is considered dangerous to cross.  Refer to 'PICREP' attribute of Front Leading Beacon for a diagram depicting main leads to Greymouth.