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Introduced with Operation Flashpoint version 1.001.00Arguments of this scripting command have to be local to the client the command is executed on
Hover & click on the images for descriptions


Checks if a group or a side knows about target.
  • Enemy knowledge is instantly shared among the group units
  • Units in the same group always perfectly know about each others
  • AI knowledge cannot check beyond current viewDistance and it resets to zero as soon as the target's distance is over it
    Note: neither fog nor daylight affect this behaviour
  • Losing sight of a target for more than 120 seconds resets its knowsAbout to zero as well
  • Magic number is the value that must be reached for a unit to shoot at an enemy (used by "Detected by" triggers as well):
Game Introduced with Operation Flashpoint version 1.461.46 Introduced with Operation Flashpoint: Resistance version 1.961.96 Introduced with Armed Assault version 1.181.18 Introduced with Arma 2 version 1.111.11 Introduced with Arma 2: Operation Arrowhead version 1.621.62 Introduced with Arma 3 version 1.821.82
Magic value 0.7 0.105 ? ? ? ?
who must be local, while target can be remote.


who knowsAbout target
who: Object, Group or Side - if a unit, unit's group is considered; if a vehicle, vehicle commander's group is used.
target: Object
Return Value:
Number in the range of 0..4, where 4 is maximum knowledge.


Example 1:
_knowledge = player knowsAbout _target;
Example 2:
_knowledge = (group player) knowsAbout _target;
Example 3:
_knowledge = (side player) knowsAbout _target;

Additional Information

See also:
Object ManipulationSides


Only post proven facts here. Report bugs on the Feedback Tracker and discuss on the Arma Discord or on the Forums.


Posted on August 4, 2006 - 10:55
Introduced with Operation Flashpoint: Resistance version 1.911.91
  • As soon as An AI unit gets hit with a bullet his knowsAbout level for the unit that shot him will instantly jump to 1.5, even if the shooter is 1000m away.
    Vice versa is also true. If An AI soldier's knowsAbout level for an enemy is 0.7 and the soldier fires and hits the enemy, his knowsAbout level about the enemy will instantly jump to 1.5.
  • Some editors have found, whilst using this command over the years, that the following characteristics have cropped up:
    • AI enemies have a very limited amount of peripheral vision, it is not nearly as good as a human player's. A target must be in front of the unit for him to be noticed, so if you sprint right behind an enemy, this value doesn't increase.
    • Depending on the unit's skill level, it can take a little time for the unit to notice a target. So if you run right past a unit, this value might not increase.
    • Bushes between the unit and the target seem to have little effect on this value, and trees definitely have no effect. You may be in a forest and can't see the unit, but he can see you.
Posted on January 16, 2007
the magic knowsAbout number is 0.105 It's not that simple. Maybe true for infantry but not all vehicles:
Reveal command sets knowsAbout to 1, but planes still won't fire at soldiers on the ground. There's only one known way to pass through this - designate target with another fake infantry unit near the target. As soon as this fake unit see the target knowsAbout lifts up to 2.5-4 and even single enemy soldiers are attacked from the air (of course if plane has suitable munition :))
Posted on June 13, 2012
According to Suma:
All friendly units within a view distance to each unit [are revealed (to the player? or each friendly?)] on the mission start. The code is half broken, as it does not make the units known, it only sets the "accuracy" value for them.
Note: This is not affecting enemy units at all.
Posted on March 27, 2013
Introduced with Arma 2: Operation Arrowhead version 1.621.62 infantry tests: It is still true that the command returns values between 0 (lowest) and 4 (most). Freshly Spotted units will have at least 1.5, slowly decreasing when the target disappeared. The following table shows my test results on a clear day in Takistan using the Vector. Please note that the returned values vary considerably depending on weather and time. Moonlight however seems to not have any considerable effect.
12:00, sunlight, clear sky
Distance knowsAbout
1530 1.5
1370 1.5
1250 1.5
1135 1.5
1055 1.52
1022 1.64
990 1.74
833 2.5
720 3.37
600 3.81
505 3.86
400 3.92
380 4
365 4
21:00, bright half moon, clear sky
Distance knowsAbout
285 1.5
120 1.5
88 1.89
75 2.3
61 3.9
23:00, pitch black, clear sky, NVG on
Distance knowsAbout
600 1.5
487 1.5
390 1.5
289 2.22
278 2.4

Bottom Section

Posted on June 3, 2018 - 10:46 (UTC)
Lou Montana
Introduced with Arma 3 version 1.821.82 knowsAbout tests, player moving towards enemy AI, facing each other:
Tests executed in VR, default date (2035-05-28), with AI behaviour "AWARE"
Daytime AI equipment AI skill and rank player stance and speed player outfit first detection distance first detection value max detection (4)
13:37 Katiba + ACO (Green) 0.5 - private Standing, running B_Soldier_F 245.663 0.148076 132.863
13:37 Katiba + ACO (Green) 0.5 - private Standing, running underwear only, rifle 246.815 1.19377 132.9
13:37 Katiba + ACO (Green) 0.5 - private Standing, running B_Soldier_F, no uniform 241.885 1.24 132.56
13:37 Katiba + ACO (Green) 0.5 - private Standing, running B_Sniper_F 156.715 2.95534 133.019
13:37 Katiba + ACO (Green) 0.5 - private Lying down, running B_Soldier_F 105.401 4 105.401
13:37 Katiba + ACO (Green) 0.5 - private Crouching, running B_Soldier_F 193.232 1.94615 134.556
13:37 Katiba + ACO (Green) 0.5 - private Standing, sprinting B_Soldier_F 235.001 1.3146 134.445
13:37 Katiba + ACO (Green) 0.2 - private Standing, running B_Soldier_F 214 0.166763 124.553
13:37 Katiba + ACO (Green) 1.0 - private Standing, running B_Soldier_F 293.065 1.11004 140.088
13:37 Katiba + ACO (Green) 0.5 - colonel Standing, running B_Soldier_F 245.641 1.20426 132.113
13:37 no weapon 0.5 - private Standing, running B_Soldier_F 421.959 0.283476 109.274
13:37 Katiba + LRPS 0.5 - private Standing, running B_Soldier_F 244.962 4 244.962
20:00 Katiba + ACO (Green) 0.5 - private Standing, running B_Soldier_F 132.089 0.62443 49.4895
20:00 Katiba + ACO (Green), no NVG 0.5 - private Standing, running B_Soldier_F 10.6837 4 10.6837

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