Hi. I would like to know how to adjust for a new altitude. I got my data set for 1000 ft Its zero'd for 200 yards, i got all data I need. Then I go hunting at 3000 ft, I got all the data too for that altitude. Then heres my big question.... How do I set it so I wont need to zero it at 200 yards at 3000ft altitude, to make sure it will get correct when i start to dail the elevation ?