Scroggs/Quarternion,. .. .I am no member of any splinter group...just been asked in the past by students what the navaids look like, I tend to keep "useful" links as the same questions tend to pop up.. .. .Profile truck ? maybe the cross section of the runway..maybe a mu meter dont know. .. .Quarternion like your handle, I wonder how many people here understand the mathematics behind your name...