Lofty, in addition to what Para said, yes, the tracers are an accurate indication of where the firing is coming from...at least the direction from which it is coming. The actual location, without getting a definite spot, could be in Action Spots nearby where your tank is area firing. If the enemy is in bocage, HE is not likely to do a lot of damage, or even keep their heads down, because shells fired at hedgerows tend to hit the berm. Try using Target Light as this will cause the tank to fire it's machine guns, which will penetrate the hedge and will have a better chance to at least make the enemy cower. Also, if you know the general area where the fire is coming from, try area fire at one AS, then give a short movement order, target an adjacent AS at that Waypoint with a 15 second Pause, then repeat as needed. also helps to let your scouts sit still for a turn or so (if they aren't getting chewed up , that is) to help their spotting abilities.