The Arken Ballistics App and use.

I have just got the latest night vision Zulus scope and will be using he ballistic calculator. Are there any instructions on how to use this? This scope is design for many types of shooting and all calibres, so does this work for the airgun shooter, who's range is limited? I will be trying to put in details such as projectile weight, BC, muzzle energy and feet per second, plus zero range. Hopefully the app is up to date with this type of shooting, as many of these calculators are designed for high powered rifles. Here's hoping that it works well. I will soon find out and let you know.