WWJP74 RJTD 180600 IMPORTANT WARNING FOR OTARU NAVTEX AREA 180600UTC ISSUED AT 180900UTC LOW 1008HPA AT 45N 136E MOV ENE 15 KT 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, SEA OFF NOTO POOR VIS 0.3 MILES OR LESS IN PLACES NXT WARNING WILL BE ISSUED BEFORE 181500UTC =