It is the radio dispatcher as he said he was talking to another ship about their arrival. They were going out to sea.
The seaman as the Japanese flag cannot be upside down...
The radio operator because he said he was talking about their arrival bit they were going out to open sea
It was the seaman as the Japanese flag is a red circle, so it can't be upside down.
The Japanese flag cannot be upside down so I think it was the seaman
It was the radio operator. The ship was just heading out to open sea, so there’s no one to contact about arrival!
The Japanese flag is symmetrical and would not look any different either way it was put up.