I have one and bring it with me but don't use it often. Usually got it all figured out before i get to my area and i am a ground guy. When i set my spots up before season i already range out my areas using things around me. Like a new recent area and with my fathers eyes getting a little worse we marked several trees in a radius with a - mark for 15 yards and a + for 25. That's about it but once you get out there you will be able to estimate distance as you get more experience.