Area always was a black art..........:}:}

Actually my point was more the proximity to terrain and other aircraft. If they get it wrong at 3/4000 feet there can be a lot less wiggle room than FL330:)(Tower Ranger and I would agree I suspect:))

Max Reheat -
Because [pedant mode on] A FL is not a number of 'feet' it is a line of constant atmospheric pressure that the aircraft flies along [pedant mode off]

where work it is very busy. I have a high r/t loading most of the time but I always say degrees after "0" ending headings and always use millibars below 1000. My r/t loading is obviously higher with these additions. But can you imagine how high i twould be if i did not take these precautions and I had to dish out some speedy avoiding action. I would sooner save my heartbeats for later life!!