Section 5: Rules of Play

At the Olympic Games and World Aquatics Events, Athletes start from a fixed starting platform, with positions assigned by random draw; at other competitions the organiser may instead choose an in-water start (Articles 3.1.1–3.1.2 of Part Three).; On the Starter's command "take your marks," Athlet...

Source: Article 3.3.4, Article 7.6.1

Send this to your friend — argument over.