Talk:Mackerel/@comment-167.250.205.171-20181015172133/@comment-80.72.61.125-20181015181143

They're not necessary, just put some active sonars, searchlights and skilled lookouts on your ships - preferably the DDs, so the rest of your fleet still easily gets rid of the enemy. I used Sonar, searchlight, skilled lookouts on my 2DDs on 3-3 and that got me at least one drop per sortie until the map was overfished.