The Mortar Squad Squadmembers - When manning the mortars, you can also see distance to the target using the squad screen just like the SL, the trick is that there has to be an active fire mission and the person(s) manning the mortars have to be in the ballistic calculator/weapon slot 4. Once the calculator is up, press the squad screen button, default caps lock or home and you will see the distance at the bottom of the map to the SL's move/observe/attack marker. Squad members that are actually firing the mortars should always be riflemen unless you have a dedicated ammo guy. If the mortars are close together you can just drop your ammo bag between them to re-supply both. SquadLeader - If you have enough grunts in the squad to keep the ammo flowing then you should move to a relatively safe forward position and observe your targets. This is far more effective than relying on 3rd parties to accurately describe where your rounds are hitting, and as such, makes it easier to correct fire with your squad. I have also read that if you are the mortar team squad leader and you are not using the Squad Leader kit your range can be off as high as 150 metres. Not sure if this is true for COOP - need to test this. A good mortar team can get accurate rds on target in less than 1 minute after a fire mission is called. If you join a mortar squad after the squadleader has marked a target on the map you may not be able to see the target - just ask the SL to re-mark and it will show up. I've also seen a bug where the target direction indicator on the compass (the little ^ thingy) never lines up with the actual target (it seems like the ^ is always off to one side of the compass or the other). This is also fixed by asking the SL to re-mark the target on the map, or in extreme cases destroying the mortar and replacing with a new one (this seems to happen more often if the mortar is not on level ground). When receiving corrections keep in mind that the minimum deviation on the mortars is 25-50 meters at upto 1,000 meters range and moving the mortar left or right 5 degrees equates to roughly 75-100 meters at that distance (decreases at shorter ranges and increases at greater ranges) so be careful when adjusting. If you have to go more than 10 degrees left or right of the target direction given...request for a new grid and/or fire mission.