If ever you were an instructor BOAC, I presume you would have specialised in the 'I can do it so why can't you' instructional technique. Whatever happened to sharing knowledge with encouragement and good grace. If you really feel that as you said, you are wasting your time, perhaps you shouldn't bother answering people's questions at all. Incidentally, that format for an NDB is certainly not common to all Boeing FMCs.