billcorr said: What MIO is best for naval anti-submarine warfare?

It's a trick question, Bill. Submarines are so vulnerable to naval strikes that I would think MIOs with the most range boosts are the most relevant. Just sprinkle in some detection on top.  

billcorr said: The 100% research bonus helps with detecting submarines, too.

You could hypothetically merge plants, grab some radar modules, then LL NAVs to others. Or sell them. Riga is a top priority to hold anyway. But I wonder if the effort is in any way worthwhile for the Soviets. Most sub attacks against them occur in areas light airframes can’t reach without being based in Allied territory. I don’t think that bonus would work on medium airframes.  

billcorr said: +5% naval targeting OR +15% range

Probably prefer the range. And I completely misread that tooltip. I was thinking it only applied to MiG and wouldn't be avialable to Ilyusian.