Tried hovering the battleplan? The game even misleads you into believing you indeed might solve the problem by commiting over 9000 ships and planes into the area. While it fact those are totally useless.If I need 30% intel, the game should probably indicate that the intel is a problem and put it in some other color than green.
Seems the fastest way to get more intel would be to bait out a fight. Might be hard with 0 ships on orders to engage from Japan though. Guess I should rush spies over there.
Tried hovering the battleplan? The game even misleads you into believing you indeed might solve the problem by commiting over 9000 ships and planes into the area. While it fact those are totally useless.
Spy network might work best/fastest, or you simply decrypt until its ripped.