Currently I know Matson Navigation Co. has routed their latest vessel (M/V Manukai) departure leaving Shanghai to head South of Japan before entering the Pacific for the crossing to the US West Coast. Maserk Lines has issued directions to route around the affected area.
US Naval vessels are now operating North of and upwind of the Fukushima Power Plant with additional support vessels heading to the West side of Honshū.
As of this afternoon requests for guidance from local USCG Districts have been kicked up to HQ but there has been no guidance with the exception of avoiding the 50 mile zone.