well not really ANSWER I think you would be more comfortable if you do, plus you run less risk of getting something on your clothes if your sitting on something you brought from home.
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I've sat at turn 9 at the Indy Car race and they were decent seats. Doesn't look like you can see too much from the grand stands, but they do have tv's. :)
Seat 102 in Row H, Section 56. Dear lord I've had some good times in that seat, yessireebob.