"C Kingsbury" wrote in message
link.net...

OK, to be precise, 100'+/- is OK, and encoders click over at 51', right?
So
you'd have to be 151' off for it to show as outside tolerance. Fly over
some
building cumulus in a 172 sometime- that can left your skirts 100' before
you know it. Better have that altitude nailed or you've violated your
clearance.


Call ATC with a PIREP on the turbulence.