From: Foggy Bottom, DC
Thanks Howard, Tigercub and HMS Resoluition,
I had believed that it was, at the earliest, around July - August '42 before IJN carriers had even experimental radar on a few CVs, but Prados is definite in claiming March '42. Tigercub's reference to the Hiryu's air officer at Midway, Cpt. Kawaguchi, does seem pretty clear, unless the translator in the interrogation botched "radar."
Isn't it interesting that this factual detail is not clear after copius research and almost 70 years?
Given the tenor of some posts I hasten to add that I am not criticizing the developers' choices. They should use the historical consensus for device dates, even if some intriguing outlier data points exist.