What does a timekeeper do?

Under World Aquatics rules, each timekeeper times the swimmer in their assigned lane:

1. Start the watch at the starting signal (the Starter stands within about 5 m of the starting end, where timekeepers can see and/or hear the signal).
2. Stop the watch when the swimmer in your lane completes the race distance.
3. If the Chief Timekeeper asks, record intermediate (split) times in races longer than 100 m.
4. Promptly after the race, write the time from your watch on the lane card, hand it to the Chief Timekeeper, and show your watch for inspection if asked.
5. Reset your watch at the Referee's short whistles announcing the next race.

Without automatic or semi-automatic equipment, there are two timekeepers per lane. At SSA inter-club and provincial championships, clubs entering five or more swimmers must supply a trained timekeeper for every session.