WWJP75 RJTD 051200 IMPORTANT WARNING FOR KUSHIRO NAVTEX AREA 051200UTC ISSUED AT 051500UTC WARNING(DENSE FOG) SEA EAST OF SAKHALIN, SEA OFF ABASHIRI, SOYA KAIKYO, SEA EAST OF HOKKAIDO, SEA OFF KUSHIRO, SEA OFF HIDAKA, TSUGARU KAIKYO, EASTERN SEA OFF SANRIKU, WESTERN SEA OFF SANRIKU POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 052100UTC =