Sights are made to improve (change) the standard one. Sniper, an arcade and arty Overcross sight for World of Tanks 0.9.18 is one of the mods, where it done really well.
From the abundance of information in the first few seconds you do not know what to do. It shows the maximum flight distance of projectile. And to the enemy is 750 meters. The sight is courtesy dictates how many seconds will be spent to damage the enemy. Then everything is as usual. Recharging time, the amount of ammunition, type and model of equipment. And the speed of the projectile flight, its type, and even the distance separation of fragments.
Overcross sight (600 KB)