This chart was hand-drawn by Walter “Fred” Cox on the day that the Calvert, part of the US Navy’s Gilbert Operation’s Northern Task Group, crossed the Equator and International Dateline. From Ronnie Cox: “My dad drew that diagram on that day to commemorate the occasion.  He couldn’t mail it home because the censors would have confiscated it  so he brought it back with him after the war.  Sadly Dad passed away in 1967 but I have the original document in my possession.”

The Calvert is listed near the center of the diagram (upper-right quadrant).