Hi Kiwi , let me see what i can do for ya . The " Range Arc " is the fan shape that the projectiles fired by a tank travel after they are fired . Since most modern tank ranges consist of multiple targets the impact zone is large .This impact zone would be the "template area" There are range fans that the tank is not allowed to shoot out side of , to also give the tank crew a refference as to where not to point the 120mm cannon . Range controll , the team that is in charge of all the firing ranges on a military post is in charge of making shure that these zones are well known to all . On most ranges that i have fired on , the maxuim target range is 2500 meters with a impact area extending out another 5000 meters . Hope I wasn't too boring .