Japan's carriers must pass through island channels where coastal observers and patrol aircraft can watch likely routes. This surveillance network would make concealment difficult unless the force threaded the center of the channels at carefully chosen times. Early contact lets the Allies shadow the fleet and prepare a night strike rather than stumble into a daylight engagement. The detection problem therefore links geography and local reconnaissance to the coalition's best tactical advantage.
Notable Point · 1:32:58-1:33:27
Coastwatchers narrow Japan's routes to the Java Sea
Island observers and patrol aircraft make a carrier approach harder to conceal and improve the chance of an Allied night interception.