I just go by the big MAP
That came with the game. But I set up the carriers so they are the only one's with Val Dive Bombers and Kate Torpedo Planes so the only time I see them is if a Carrier is near by and all the Jap War Ships that are supost to have the FM1 Pete now have them so I also know when they are around.
And if you see the Q1W1 a Betty or H6K or H8K your near an Air Base but of course all Carriers and Air bases have Zero's.
At the start of each mission I use the Compass and draw out a range circle using the big map as a reference where each of the Air bases are to about 1,500nm for bombers and then another circle of 600nm so I know when there are also a chance of Zero's as well as Bombers. It works out pretty good, at least for me.
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