=Technical Assistance= 
 I deleted this: 
 :"Page 81, left-column has the text " ... Nevertheless some wireless communication had to take place, for it would be folly to expect the voyage for this armada of ships to co-ordinate without it.  Short wave signals from Japan could be picked up by the larger ships but not the small craft - more especially the low-lying submarines - this was impossible, because of their aerials and the curvature of the earth.  To solve this problem Nagumo's radio technicians had to resort to a subterfuge. High frequency (short wave) signals, picked up by one of the carriers, were re-transmitted simultaneously on a low frequency [sic longwave].  These short range signals the smaller ships could intercept, and the hoax worked almost perfectly because none of the US monitoring stations was looking for a Japanese signal in the low frequency band.  However, ..."  [Release of the classified CV AKAGI source materials would be very helpful here.]" 
 This is as mistaken as the belief of Lurline's radioman, based on an inadequate grasp of naval communications. Under radio silence, navies resort to older techniques, developed & used for decades before radio, blinker light & morse; when these are inappropriate, flag & semaphore, in use for over 200yr, are available.