The mission of the sniper is to hit his target with his first shot and survive.
To improve his chances for survival in a hostile environment a sniper should engage his targets from as far away as practical while still ensuring a first round hit. Therefore accurate range determination is essential to the successful completion of the sniper’s mission.
There are a number of methods for determining range. The sniper should select the most accurate method whenever possible and should train and equip him self to use many different methods.