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"I know this question is quite old but I found it through Google so I'm sure others will in the future and an answer now will still help them.
I used the Creation Kit to check out exactly what these perks did. It turns out they just lower the modifier that movement has on your Visual based detection chance. By default a "Movement" modifier is part of the Visual detection aspect of sneaking (It is also part of the Sound factor as well, but that Movement stat is different and is based on gear weight, it has no effect from the Covert Operations perk).
The overall Sneak detection chance equation is very complex, having far more parts than just the Visual factor, but I feel is irrelevant to this question as it will only very much confuse the discussion.
Part of the sneak detection equation is "Visual Factor" which has several components. The whole equation is:
Visual factor = Attenuation * VisualContact * Light * Movement * Blindness * Invisibility
As you can see, part of this equation is this Movement stat. On it's own is sort of an On and Off switch to the detection formula. When you're standing still the value is 0, when moving the value is 1. So moving just adds an extra multiplier to the chance of being detected.
The Covert Operations perk lowers that value down from 1, decreasing the overall effect movement has on your detection chance. The value per rank are:
Rank 1: 0.96 Rank 2: 0.92 Rank 3: 0.88 Rank 4: 0.84 Rank 5: 0.80 Rank 6: 0.76 Rank 7: 0.72 Rank 8: 0.68 Rank 9: 0.64 Rank 10: 0.60
So as you can see, this Perk can nearly cuts the effect of movement on Stealth in half, it's a great bonus when you consider it costs you no manual Perk points, just the collection of some magazines."
I am sure they should stack with the armor mod ... was it muffled?
no run penalty
+50 stealth
x0.5 movement detection.
10x Covert Ops mags is x0.6 movement detection. (so x0.3 overall when combined with stealth 5)
The invisiblity part is Stealth Field (96% stealth boy, 20%/piece chameleon, 50% stealthboy power armor mod)
Shadowed armor mods reduce 'detection: light' by 5% each (all armor mods added together)
Muffled armor mods reduce 'detection: movement' by 5% each (all armor mods added together)
This should multiply the value from Covert Ops & Sneak.
(so with 4 it would be 0.8x whatever you get from other perks)
EDIT: muffled also adds an enchant that give -10% detection: movement as well.
(so each piece actually gives -15%? I'm not sure why it's split into 2 different effects...)
1. Each agility supposedly improves stealth by 1%, but i couldn't verify this in my own tests. The perks and movement speed are much more important.
2. About 5% per book, i have 3 on my test char so ~15%
3. It doesn't, just equipped armour makes a difference
4. This is the same as magazines i think at 5% a piece, but because you can equip 6 pieces at once (and many do) it gives the *feeling* it's more powerful than it really is.
5. Muffled only gives a bonus if you have the stealth perk which reduces chance to be detected regardless of whether you're running or walking.
6. 25% damage bonus with silenced weapons, so probably the same for stealth.
-Keep in mind, although this all stacks additively, you need in excess of 300% Stealth to be truly good at sneaking. Unless you played Skyrim and already know how to best sneak like me
You can become totally invisible to perception 4 or 5 enemies, but perception 7+ will be difficult to sneak around.
Full of ♥♥♥♥♥♥♥. I did a 10,012 agil test and a deathclaw still detected me.
They have the lowest perception in the game. They're the easiest to sneak up on.
They're all strength and endurance.
https://imgur.com/a/hQRJpr3
So sneak rank 5 further increases the sneak ability? I thought it only gave that ... special trait.
Ace Operator (Nukaworld end perk) is 1.25x silenced weapon damage & 0.9x detection: light
*dies of laughter*
Perception is broken then. I can literally touch a deathclaw and they won't realise i'm there.
I am sorry for bringing this topic again but the wiki says sneak rank 4 already grants 50% sneak bonus and says rank 5 only makes distant enemies lose you...
Are you really sure? Im asking because I also dont like the chamaleon effect and most people consider it an useless perk rank.
The highest rank of sneak isnt a chamleon effect like the legendary armors. It just makes enemies lose track of you faster if you are hidden.
Float is 50.000000 for perk Senak04.
Sneak05 does not have float for that Function Parameter at all, providing Invisibility spell for PerkSneakInvisibility.
Sneak05 does also have Mod Detection Movement, with 0.5000000 float value.
So the +50 is indeed the combined bonus with Sneak05, with movement detection modifier and short invisibility.
If you are annoyed by VFX - like I am - then try this mod.
Crimsomrider's Perk VFX Removal (Night Person - Sneak Rank 5)
https://www.nexusmods.com/fallout4/mods/24510