MakeItHappen..., are you implying that NVFR requires a visual fix to descend once a lower LSALT applies to a route segment? I read your comment that way the first time but now I'm not sure. Anyway, if you are, that's not quite correct. You may use IFR radio navigation techniques to descend to a new altitude without ever sighting the ground. You could choose to use IFR LSALTs directly from a chart, or calculate x-bearings, or use a bearing/DME fix etc. However, if you wish to descend *immediately* you pass a limiting obstacle, then the fix must be visual.
The difference is that radio nav position fixes must include a buffer. A visual fix does not.
Last edited by Tinstaafl; 23rd May 2013 at 00:46.