How do seeding batches and timing work?

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Seeding: your Ultra qualifying time, or your Half seeding time, decides your start batch, so runners of similar pace start together. No moving up: you can't change your seeding. Starting in an earlier batch than allocated, or jumping a batch, means disqualification. Moving back is allowed: you may drop to a later batch, but your time then runs from that batch's gun. Official time is gun-to-mat for your batch: your time starts when your batch's gun goes. Net (mat-to-mat) times are published for reference only; only gun-to-mat times count in the official results. Medal times are also based on your batch's gun time. The Ultra starts in batches from 06:00 and the Half from 07:00, on Newlands Main Road. Arrive early: runners not in their chute in time are moved to the back.