This is a smart ballistic calculator. It can use G1, G7 and... custom drag-functions! Can calculate trajectory without using ballistic coefficient! You can select reticle from the list (2277 reticles!) and see holdovers at any magnification (see list of reticles supported here http://www.strelokpro.online/StrelokPro/ios/reticles.html) 4047 cartridges database 3361 bullets database and 726 G7 ballistic coefficient bullets database 574 air rifle pellets database Can calculate spin drift, Coriolis effect, gyroscopic stability factor and vertical deflection of crosswind. Internal barometer support Vectronix Terrapin X rangefinder support MTC Rapier Ballistic Rangefinder support NTC Tomahawk Rangefinder support Kestrel Drop and Kestrel 5x00 support Supports imperial and metric units. Supports WeatherFlow WEATHERmeter Skywatch BL weather meter support Skywatch BL1000 weather meter support Density Altitude support Apple Watch support Field-proven accuracy since 2007