The speaker's script: 2 minutes to official top · 1'30 · 1 minute · 30 seconds · 20 · 10 · 5, 4, 3, 2, 1 · official top · plus 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 25, 26, 27, 28, 29, 30 · start cancelled.
Start window in the pool: 0–10 s free, 10–30 s with a penalty.
Surface protocol, 15 s: Facial equipment off → OK sign → Say “I'm OK”. In this order, within 15 seconds, without dipping the airways.
One start: press Start and the count runs from the full script — or, training alone, from 2:00, 1:30, 1:00 or 0:30 (“Count from”).
Start list: the first official top at the time you set, then every N minutes — the way a competition runs. Keep the screen on.
From AIDA Competition Rules 17.5, §4.2.9, quoted as written. A training aid, not the rulebook — the judge's word and the current rules of the federation come first.