Talk:Winter 2015 Event/@comment-49.145.182.65-20150213193539/@comment-25730832-20150213203701

There's 2 types of Line of sight (LoS) that we usually talk about: http://kancolle.wikia.com/wiki/Line_of_Sight

First is the Fleet Line of Sight (FLOS) which is pretty much their LOS combined to get a very big number [number beyond 100 is usually a FLOS]

Seond is the Effective Line of Sight (ELOS) which is effected by your equipment's LoS and is calculated based on a formula [usually a smaller number. There's two formulas right now, new one is being tested to deal with the old one's inconsistency]

What usually prevents you from getting to a specific node is the latter. In this case, your ELOS went below the minimum requirement to reach the boss node. For E-1, I found 1 seaplane and 2-3 radars on the DD to be pretty stable route to boss node, but didn't test too much into it to actually confirm that.