I have been working with José Miguel Pinto dos Santos on the Genna-kokaisho (1618) [Voyage of the Genna-age] the Japanese translation and adaptation of a Portuguese nautical guide. It was written by one Ikeda Koun after traveling with pilot Manuel Gonçalves from Nagasaki to Luzon, in the Philippines. Genna-kokaisho is online here. There are many reasons that make this a very important document. It appears to be the first known Japanese text with Western (Portuguese) navigational techniques. This is the second time I am involved in a project with José Miguel. Years ago we studied the very important text Kenkon bensetsu. We published a paper together and then he went on to study the text in more detail and publish more.