WWJP75 RJTD 170600 IMPORTANT WARNING FOR KUSHIRO NAVTEX AREA 170600UTC ISSUED AT 170900UTC 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 171500UTC =