WWJP74 RJTD 051200 IMPORTANT WARNING FOR OTARU NAVTEX AREA 051200UTC ISSUED AT 051500UTC WARNING(DENSE FOG) SEA WEST OF SAKHALIN, SOYA KAIKYO, SEA WEST OF HOKKAIDO, TSUGARU KAIKYO, SEA OFF HIYAMA AND TSUGARU, SEA OFF SOUTHERN COAST OF MARITIME PROVINCE, SEA OFF AKITA, SEA OFF SADO POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 052100UTC =