ORIGINAL: bevar
Well,
Here's how I look at it. Practicing a week or two before the NATS at Markham Park is foolish, besides if you obey the boundaries, you really can't fly the sequences properly anyway. It kind of reminds me of the time I torque rolled my $10,000 40% Extra into the dirt one week before the Regionals. Everyone kept telling me "Man, I would not be doing that if I were you", but I did it...one time too many...and BOOM! Scratch one plane.
Markham is a great field, and we all fly some real expensive hardware there, but so do some other guys with $50 aircraft so you have to be careful. You pay your price, you take your chance...but flying an IMAC sequence without a spotter...especially at Markham...that's unbelievable.
Beave
You need two spotters at Markham, one when your flying the other to guard your belongings when your back is turned.