Talk:Combat/@comment-101.127.148.174-20140907031725/@comment-25361436-20140910074459

You'll probably be wanting higher LoS. When it comes to artillery spotting, the best way to get more LoS is to level up your ships. Higher level ships essentially means more spotting. That LoS formula that you're using is primarily for maps with LoS checks and uses ship LoS as a very small contributing factor, but for artillery spotting, it's thought that all forms of LoS are weighed equally and you gain a 0.08% chance to trigger artillery spotting per point of LoS from a base activation rate of about 50%.

As for the set-ups, there's a table on this page pointing out all possible gun set-ups for artillery spotting. While a yellow gun can be used to trigger it (in combination with red gun(s), as 2 yellow guns will not trigger it), they are not necessary for artillery spotting.