Horus Vision's Advanced Ballistic Calculators (ABCs) - rugged handheld computers paired with the company's ATragMX ballistics software can be customized to individual weapons to provide precise accuracy even at extreme distances. ATragMX software from Horus Vision offers shooters the precise ballistics solutions. The software was developed based on data compiled by the Armament Research, Development and Engineering Center (ARDEC), the Army's principal researcher, developer and sustainer of current and future armament and munitions systems. ATragMX goes beyond standard atmospheric and targeting data by allowing shooters to reverse-model results for individual guns. After test-shooting their weapons, snipers can feed data back into the software to create more precise calibration for those weapons. This provides better accuracy than the predictive, one-size-fits-all, solutions of typical ballistics software.