I hunt in 3 different conditions. One of them is 3300ft, one 5200ft, one 1300ft, with pressure and humidity values for the aformentioned varying also. What I am trying to figure out is how to figure out the differences my charts will change with the 3 different conditions. It seems as simple as plugging the values in on the G7 calculator and away you go. Where my concern of accuracy to the charts would be if your velocity changes. For instance, lets say you are shooting 3000fps at 3300ft, but technically is my velocity gonna change when moving to the higher and lower elevations? If so, then that would make my charts inaccurate if I haven't chonographed them directly at those elevations, wouldn't it???? Or am I just extremely overthinking the topic? If you are confused by my question, you should be, because I have myself half confused writing it. hahaha Basically what I am saying is if I have a chrono'ed velocity, and I use that velocity to figure the other elevations, will it be accurate?