Talk:Winter 2015 Event/@comment-210.195.138.32-20150217192152/@comment-26062182-20150217211451

(LoS) Line of sight. It has to be high enough to find the enemy boss. The requirement depends on difficulty, but I think equipping a ship with a Recon plane and other ships with a few radars should be sufficient for E-4. The report and results page for E-4 should have more information.