I take and use my range finder on every trip to the woods. The last thing that I do before settling in is to range every possible "shot zone" that I can find...out to, but not beyond 40 yards. I'll use my first 15 minutes to carefully look over my current hunting area and try to visualize where a deer could come from and where I may be able to stop them. I'll memorize the 5-6 shot zones that I pick and then put the RF away for the rest of the hunt.