Compare Limitations: Line of Sight

okay so you're zeroed out tim zeroed out and blaine's gotta hit his get back to his benchmark three and three sixteenths and uh what we're just trying to do is compare and contrast let you guys decide which one's right for you none of these companies pay us they probably don't even like us okay so he's got his benchmark and now we're going to go over here so so if he wanted to take an elevation mark right here yes we need this elevation right here he can't get it can't get it but now let's just say you need the elevation down here what's the change in elevation i want to show the math so we have a limited line of sight with that and how do we know that