ARCHER BCA-01 is an autonomous ballistic calculator designed for calculating corrections for the chosen type of weapon / ammunition, depending on the distance to the target and weather conditions. The device is equipped with a laser rangefinder, a weather station, a digital compass and an inclinometer. Special software that works on different platforms (OS Windows, Android, iOS) is used for device parameterization. The device is installed on the day sight in such a way that the display of ballistic calculator is in sight of the operator. It allows to conveniently read corrections data and other measured parameters.