I like how the mortars are not precise when your location is know by the enemy but the problem is they know where you are without anyone spotting you. You can be sneaking up a hill with no one in sight and the next thing you know a mortar lands on you.
If the user needs to call in the location of a mortar to the mortar team the AI should also need to do so. Unless they guess but it seems much to close to be a guess.
Note: Even if the enemy has called in a direction of attack, they should be putting rounds down in a situational spot instead of directly on top of the unknown location of enemy contacts.
EDIT: This can be hugely problematic when you get a radio call about mortar teams firing and the only thing you can do is run around like a chicken with your head cut off in the open hoping no enemy AI spot you when doing so.