When AO-7 is in B mode it's down link is FO-29' uplink. I was thinking, even though their ground track as seen on Satpc32 do not line up, would not they be able to "see" each other? Which begs the question, how does one determine what that "see" part is? Is there a quick back of the envelope calculation one can do? Keep it simple. Thanks Bob W7LRD Seattle