Talk:Type 4 Passive Sonar/@comment-73.224.155.203-20160702004629/@comment-232062-20160702011616

If you are willing to sideline other things that use your daily screw quest you can max a couple of T93 sonars super cheap and just wait to see what the next event,eo or world map brings, that would only leave you with the actual upgrade step going from T93 to T4.