Line of Sight

Introduction
Currently, there are three known purposes for Line of Sight (LoS):
 * Increasing success rate in the detection phase, which allows participation in aerial combat.
 * A higher Fleet total LoS (FLoS, or knowm as Simple LoS) positively correlates with the trigger chance of artillery spotting for a ship's double/cut-in attack in day battle.
 * Fleet total LoS is simply the summation of all LoS stats from your ships, including bonus from the equipment.
 * Effective LoS (ELoS), which allows the fleet to reach a specific node (usually a pre-boss or boss node) instead of being diverted to a dead end.
 * Effective LoS is employed in many Event Maps, Extra Operation Maps (including 1-6, 2-5, 3-5, 4-5), and some World 6 Maps.
 * There are special formula being used to calculate ELoS. As a general consensus, LoS bonus from equipment (esp. recon planes) are more important than individual ship's LoS stats.
 * See sections below for current established formula on how to calculate eLoS.
 * Reconnaissance Seaplane equipped on CL with no plane slot can contribute to LoS. But if it is equipped onto ships and then get shot down, it cannot contribute to LoS check performed afterward.

2-5 old formula
To avoid confusion, content here are archived into a subpage which only serve as reference purpose. Note that those value obtained fro. 2-5 old formula are not compatible with those from 2-5 new/fall formula nor the simplified formula.

2-5 fall formula 【current de facto standard】
With the advent of the 2014 Fall Event a new formula for Effective LoS has been devised to account for inconsistencies of the old formula.

Also known as 2-5 autumn formula, 2-5 new formula or new eLoS formula in some places. It is also the elos formula or the los formula as it have already become a de facto standard on how to calculate (e)los. Excel file that calculates the fleet's LOS for you: http://1drv.ms/1IlzXGX (courtesy of Kouma231)
 * Effective LoS = Dive Bomber LoS x (1.04) + Torpedo Bomber LoS x (1.37) + Carrier-based Recon Plane LoS x (1.66) + Recon Seaplane LoS x (2.00) + Seaplane Bomber LoS x (1.78) + Small Radar LoS x (1.00) + Large Radar LoS x (0.99) + Searchlight LoS x (0.91) + √(base LoS of each ship) x (1.69) + (HQ Lv. rounded up to the next multiple of 5) x (-0.61)
 * √(base LoS of each ship) x (1.69) = Calculate the square root of each ship's LoS (base value without any equipment) separately, then add the values together and multiply by 1.69
 * Regarding the HQ Level: For example, if your HQ Lv. is 101~105, use 105. If it's 106~110, use 110. And so on.

new fall simplified
This formula is newer than the formula mentioned above, its difference from the 2-5 fall formula is that it simplified a bit the calculation process by dividing the 2-5 fall formula with a factor of 1.6841056 and tidying up (round off and matching test result graph) some numbers. However values obtained from this formula is NOT compatible with 2-5 fall elos values, and thus it is not yet in active use as of today.

Model
There are two different models applied to calculate the new fall simplified elos. Model A is used by tools like Hoppo Alpha, while Model B is used by tools like Electronic Observer.

The difference is that, in model A, after elos value from kanmusu is added, they are first rounded off before adding up together, and so as the multipled hq level. On the other hand, in model B, kanmusu and hq level values are added together before being rounded down. According to post from Hoppo Alpha's author, applying model A onto existing data give a more linear increase in boss entry rate per every point increment and thus he applied Model A onto Hoppo.Alpha.


 * p.s. LoS value from kanmusu in the above paragraph = summation of all equipment's los value following the rule (equipment LoS value multiply by equipment multipler) and then plus the square root of kanmusu's own naked LoS value (without equipment)

Unknown Factor in calculatiom
Currently, how the elos would be affected by following items are still unknown.
 * Fighters
 * FCF
 * SCAMP
 * ASW Liason Plane
 * Radar Improvement
 * Aircraft Proficiency