July the 20th is the Marine Day．In 1876，Emperor Meiji inspected north east Japan，
and returned　from　Aomori to Yokohama on the most up-to-date lighthouse inspection vessel the“Meiji Maru”．
As the Emperor　arrived　safely in Yokohama on July the 20th，
the day was designated as a national holiday in 1996．
The Marine Day has a wide connection with aids to navigation activities．