Talk:Akashi's Improvement Arsenal/@comment-36.80.96.150-20151230184253/@comment-26948048-20151230190121

If you just got Akashi, I heavily discourage improving/upgrading Sonars as your screws would be better spent in improving heavy gun mounts (more specifically, 35.6cm and 41cm), AP Shells, quintiple torpedoes, 12.7cm Model B, and so on. They will be more useful in the long run for a lesser number of screws, while upgrading a Type 93 Passive Sonar to a Type 4 Passive Sonar is particularly costly and will see limited use compared to the aforementioned pieces of equipment.

That said, the table merely lists which ships can be used to improve what, and on what day. For upgrading a T93 into a T4, you can use Shigure Kai Ni on Thursdays, Saturdays and Sundays (JST), but if you use Yuubari it'll upgrade into a Type 3 Active Sonar instead.