Keen Vision is a crew skill available for all crew positions in ground and air vehicles.
Enhances the detection range when spotting enemies, i.e. the maximum distance at which the target indicator may appear. This ranges between 4km (untrained) to 8km (maxed). Detection is only made within a cone in the direction of view of the player. Maximum detection distance is also dependent on the size of the target, lighting conditions and other factors.
In ground vehicles, the Keen Vision skill determines at what distance the player can see an enemy ground vehicle that's under cover. The game server only sends information of a vehicle that's concealed to the client when the player is at a minimal distance from the enemy. This distance is around 500-700m with crew that's not leveled up and up to three times as much with the crew fully leveled up.