About TAKAGI Toshiyuki
About TATEYAMA Kazutaka
About ONO Jun
About Proceedings of the International Symposium on Okhotsk Sea & Sea Ice
About sea ice
About edge
About navigation (location)
About navigation (operation)
About route (air transportation)
About optimization
About Arctic Ocean
About Northern Sea Route
About modification
About Navigation and practical business
About 海氷
About 縁部
About 予測
About 北極海航路
About 計画