Yamato class carrier

Maybe I missed something but the last few posts proposing or arguing for a relocation of the Pac Fleet to PI seems to assume the IJN will not know where it is. Correct me if I am wrong but is this hand waiving away the existance on IJN air and naval reconnaissance routinely covering the Japanese mandates? It also seems to be ignoring the numerous IJN & IJA warships, convoys, and cargo ships crossing the region on errand, and heading south to deal with the Dutch East Indies. At the core of all this is the Truk naval base where nearly half the IJN had been operating out of. The direct route from Oahu to PI cuts right through a cloud of atolls with air and naval stations, basing reconnaissance squadrons, surface patrol boats, and every atoll with a radio station or two.

To avoid all that this notional fleet is going to have to circle all the way south to Australian Dutch East Indies waters, then go north to PI.

OTL the Japanese kept major fleet elements positioned to interdict any US task force or major fleet intruding into the central Pacific or attempting the PI. Unlikely thy would not do that in this situation.
 
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