The spotter detects, observes, and assigns targets and watches for the results of the shot. Using a spotting scope or a rangefinder, the spotter will also read the wind by using physical indicators and the mirage caused by the heat on the ground. Also, in conjunction with the shooter, the spotter will make calculations for distance, angle shooting (slant range), mil dot related calculations, correction for atmospheric conditions and leads for moving targets. It is not unusual for the spotter to be equipped with a notepad and a laptop computer specifically for performing these calculations.