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Currently, there are three known purposes for Line of Sight (LoS): 

Currently, there are three known purposes for Line of Sight (LoS): 

* Increasing success rate in the detection phase, which allows participation in aerial combat. 

* Increasing success rate in the detection phase, which allows participation in aerial combat. 
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* A higher '''Fleet total LoS''' (FLoS, or known as '''Simple LoS''') [http://kancolle.wikia.com/wiki/Artillery_Spotting#The_Trigger_Chance_of_Artillery_Spotting:_.28Beta_ver..29 positively correlates] with the '''trigger chance of [http://kancolle.wikia.com/wiki/Combat#Combat_Equipment_Setups artillery spotting]''' for a ship's double/cutin attack in day battle. 
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* A higher '''Fleet total LoS''' (FLoS, or known as '''Simple LoS''') [[Artillery_Spotting#The_Trigger_Chance_of_Artillery_Spotting:_(Beta_ver.)positively correlates]] with the '''trigger chance of [[Combat#Combat_Equipment_Setupsartillery spotting]]''' for a ship's double/cutin attack in day battle. 

** Fleet total LoS is simply the summation of all LoS stats from your ships, including bonuses from the equipment. 

** Fleet total LoS is simply the summation of all LoS stats from your ships, including bonuses from the equipment. 

* '''Effective LoS '''(eLoS), which allows the fleet to '''reach a specific node''' (usually a preboss or boss node) instead of being diverted to a dead end. 

* '''Effective LoS '''(eLoS), which allows the fleet to '''reach a specific node''' (usually a preboss or boss node) instead of being diverted to a dead end. 
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** Effective LoS has been employed in many [[EventsEvent Maps]] since [[Spring 2014 Event]], Extra Operation Maps (including 16, 25, 35, 45), and some [[World 6: 中部海域World 6]] Maps. 
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** Effective LoS has been employed in many [[EventsEvent Maps]] since [[Spring 2014 Event]], Extra Operation Maps (including 16, 25, 35, 45), and some [[World 6]] Maps. 

** There are special formulas being used to calculate eLoS. As a general consensus, LoS bonuses from equipment (especially reconnaissance seaplanes) are more important than an individual ship's LoS stats. 

** There are special formulas being used to calculate eLoS. As a general consensus, LoS bonuses from equipment (especially reconnaissance seaplanes) are more important than an individual ship's LoS stats. 

** See sections below for the currently established formula on how to calculate eLoS. 

** See sections below for the currently established formula on how to calculate eLoS. 
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== Effective Line of Sight calculation method == 

== Effective Line of Sight calculation method == 

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<! 

=== 25 old formula === 

=== 25 old formula === 

To avoid confusion, content here is archived into [[Line_of_Sight/Deprecated_Formula#Effective_Line_of_Sight_.2825_old_formula.29a subpage]] which only serves as a reference. Note that the values obtained from the 25 old formula are not compatible with those from 25 new/fall formula nor the simplified formula. 

To avoid confusion, content here is archived into [[Line_of_Sight/Deprecated_Formula#Effective_Line_of_Sight_.2825_old_formula.29a subpage]] which only serves as a reference. Note that the values obtained from the 25 old formula are not compatible with those from 25 new/fall formula nor the simplified formula. 




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=== 25 fall formula=== 
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=== 25 old formula === 
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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. <ref>http://wikiwiki.jp/kancolle/?%C6%EE%C0%BE%BD%F4%C5%E7%B3%A4%B0%E8#area5</ref><ref>http://ch.nicovideo.jp/biikame/blomaga/ar663428</ref>

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Deprecated, click [[Line_of_Sight/Deprecated_Formula#25_fall_formulathis link]] for details. 
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Also known as '''25 autumn formula''', '''25 new formula''' or '''new eLoS formula''' in some places. It is also '''the eLoS formula''' or '''the LoS formula''' as it has already become a defacto standard on how to calculate (e)los. 

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* Effective LoS = Dive Bomber LoS x (1.04) + Torpedo Bomber LoS x (1.37) + Carrierbased Reconnaissance Plane LoS x (1.66) + Reconnaissance 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 level rounded up to the next multiple of 5) x (0.61) 

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* √(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 

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* Regarding the HQ Level: For example, if your HQ level is 101~105, use 105. If it's 106~110, use 110. And so on. 

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Excel file that calculates the fleet's LoS for you: http://1drv.ms/1IlzXGX (courtesy of [[User:Kouma231Kouma231]]) 






=== new fall simplified === 

=== new fall simplified === 

It is a tidy up version of 25 fall formula. Click [[Line_of_Sight/Deprecated_Formula#new_fall_simplifiedthis link]] for details. 

It is a tidy up version of 25 fall formula. Click [[Line_of_Sight/Deprecated_Formula#new_fall_simplifiedthis link]] for details. 
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> 
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===Unknown Factors in 25 Fall/NFS Formula calculation=== 

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Currently, how the 25 fall formula would be affected by [[List of Fighters by statsFighters]], [[Fleet Command FacilityFCF]], [[Skilled Carrierbased Aircraft Maintenance PersonnelSCAMP]], [[Type 3 Command Liaison Aircraft (ASW)ASW Liason Aircraft]], [[Improvement]], and [[Aircraft Proficiency]] are still undetermined. Some calculators assume equipment in the list have 1.00x of their los value influence on the 25 fall value. 






===Formula 33=== 

===Formula 33=== 
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Requires further testing. Similar to the New Fall Simplified formula, but reportedly more accurate. Using this model, a value of 31 eLoS would guarantee failing the 25 LoS check, while a value of 33 eLoS would succeed 100% of the time. It is described as follows<ref>http://ja.kancolle.wikia.com/wiki/%E3%83%9E%E3%83%83%E3%83%97%E7%B4%A2%E6%95%B5</ref>: 

Requires further testing. Similar to the New Fall Simplified formula, but reportedly more accurate. Using this model, a value of 31 eLoS would guarantee failing the 25 LoS check, while a value of 33 eLoS would succeed 100% of the time. It is described as follows<ref>http://ja.kancolle.wikia.com/wiki/%E3%83%9E%E3%83%83%E3%83%97%E7%B4%A2%E6%95%B5</ref>: 




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<math>\phi = \sum^{\text{All Slots}} C_{l} \cdot ( S_{l} + S_{\bigstar} ) + \left(\sum^{\text{All Ships}} \sqrt{L}\right)  \lceil 0.4 H \rceil + 2M</math> 
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<math> 
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\begin{align} 
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<math>S_{\bigstar} = C_{\bigstar} \cdot \sqrt{\bigstar}</math>

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\phi &= \sum_{s \in \text{Ships}} \sqrt{L_s} + C_{n} \sum_{l \in \text{Slots}}C_{l} ( S_{l} + S_l^{\star} )  \lceil 0.4 H \rceil + 2(6N) \\ 

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S_l^{\star} &= C_l^{\star} \cdot \sqrt{\bigstar_l} 

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\end{align} 

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</math> 





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*<math>L_s</math> is the ship's base LoS 

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*<math>C_{n}</math> is the node factor, it represents the weighting of the formula that is '''known to vary''' across different maps and nodes. For example, in 62, the node factor of C<sub>n</sub> = 3 means that equipment is 3 times as important compared to the original formula (as tested in 62F/H). See following section for more details. 

*<math>C_{l}</math> is the equipment multiplier: 

*<math>C_{l}</math> is the equipment multiplier: 

**CarrierBased Fighter: 0.6 

**CarrierBased Fighter: 0.6 
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**Large Flying Boat: 0.6 

**Large Flying Boat: 0.6 

**Seaplane Fighter: 0.6 

**Seaplane Fighter: 0.6 

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**Midget Submarine: 0.6 

*<math>S_{l}</math> is the displayed LoS value of the equipment 

*<math>S_{l}</math> is the displayed LoS value of the equipment 
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*<math>S_{\bigstar}</math> is the equipment's improvement bonus to eLoS 
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*<math>S_l^{\star}</math> is the equipment's improvement bonus to eLoS 
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**This is calculated by multiplying <math>C_{\bigstar}</math>, the improvement multiplier of that equipment, with the square root of the equipment's improvement level. 
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**This is calculated by multiplying<math>C_l^{\star}</math>, the improvement multiplier of that equipment, with the square root of the equipment's improvement level. 
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***The improvement multiplier of all Radars is 1.25, Reconnaissance Seaplanes is 1.2, and Searchlight is 0 (that is, it receives no eLoS bonus when improved) 
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***The improvement multiplier of Small Radars is 1.25, Large Radars is 1.4, Reconnaissance Seaplanes is 1.2, and Searchlight is 0 (that is, it receives no eLoS bonus when improved) 
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*<math>L</math> is the ship's base LoS 


*<math>H</math> is the HQ level. The ceil operation means that the value is rounded up every 2.5 HQ levels. 

*<math>H</math> is the HQ level. The ceil operation means that the value is rounded up every 2.5 HQ levels. 
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*<math>M</math> is an additional variable representing the number of empty ship slots in your fleet. For instance, if your fleet contains only 2 ships, <math>M</math> would be 4 and thus <math>2M</math> would yield 8. 
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*<math>N</math> represents the amount of ships you have in your fleet. 

**It is unknown whether this value increases midsortie if a ship disappears from your fleet (e.g. sinking). 

**It is unknown whether this value increases midsortie if a ship disappears from your fleet (e.g. sinking). 

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====Equipment LoS weighting modifier==== 

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*Also known as node factor 

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*In some maps, weighting of equipment would be higher than that others. 

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*It is represented as C<sub>n</sub> in the formula. 

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*For all tested nodes, C<sub>n</sub> for 25 is 1, for 35 and 61 are 4, for 62 and 63 are 3. 

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**That mean equipment LoS are 3 times more important in 62 and 63 compare to 25 and four time as important in 35 and 61. 

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**In other words, ship LoS are less effective in those maps with higher equipment weighting modifier. 

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*In 25, F33(C<sub>n</sub>=1) have to be larger than 31 to have a chance to enter boss and 33 to guarantee boss entry. 

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*In 62, F33(C<sub>n</sub>=3) have to be less than 43 to guarantee F>H and more than 40 to guarantee H>K 

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====Special Notice to users of KCV v.4.2.5 as well as older version of some other software==== 

====Special Notice to users of KCV v.4.2.5 as well as older version of some other software==== 

*Please update your software to a more recent version which patched a calculation mistake. 

*Please update your software to a more recent version which patched a calculation mistake. 