Targeting computers are small electronic devices that upgrade the basic gunnery systems of standard cars and vehicles. They are expensive but give occupants of a vehicle a bonus to hit. They must be bought per occupant (thus for both a driver and a gunner to benefit, two computers must be bought), but it is possible for only one computer to be bought for one person, or different computers to be bought for occupants. They are not compatible with and never combine their bonuses with any sort of turret or missile computer. Nor do they affect passive weapons at all.
Sometimes you want another mode for the turret computer, one that allows the you to specify the target, and fire when you want to, not when the computer wants to, and one that allows you to change the target whenever you want. And here it is!
In this mode, the turret is completely controlled by the driver or gunner of the vehicle. The turret will not shoot at any target, nor engage targets of opportunity, nor will it default to any other mode. Instead, the driver or gunner controls the turret and it will shoot at the target that the controller wants it to shoot at, and when.
Normal turret computer modifiers apply though (like shooting through smoke and the accuracy modifiers). Aiming and firing the turret in this mode costs a standard shoot action.
One person only, can control the turret at a single time though, defaulting to the gunner as standard (if one is installed). This means that no other person can use the turret until control of that turret is given up.
Control of the turret can be passed to another person. This costs a standard shoot action for either the current controller or for the person wishing controlling of the turret. On the phase of the control change, the turret may not be used by anyone.
To have the Target mode software costs $5,000, but it requires that the turret have a turret computer already installed.