Elevation is one factor, the other is the azimuth. Depending on your location, look around at other people's DN dishes, see notice that they're pointed off true south? 91 is almost directly south. In the midwest it points almost directly south. It's quite a swing actually (about 1 inch on the mast for me)
Your screen should look like this one, note the flag on the top right that people are referring to. See how it matches the sat you've selected?
Sorry for the large picture, but i can't seem to resize the stupid thing... Oh well, the bigger the clearer.
