[Marcello]

"May I ask you how you tried to model these "smart" rounds and what were the results?"

By setting up copies of the guns in questions (I used G5 and 240mm mortars) and increasing gun accuracy to values of 90 and such and then using them for indirect fire missions, using FOs (after all you need someone to designate the target, they are not GPS) or else.I did not notice any significant improvement over the normal versions, all else being equal.