How many timers (stopwatches) do you expect us to have in addition to the app?
FINA requires one timer (stopwatch) for the Speed event, and one for the Endurance Event. The Speed event timer will be used as a backup timer to the gym-timing system referenced in the case of an App malfunction. The Endurance event timer will be used to enforce the :20 second time limit between obstacles.
As a reminder, FINA does not require any specific course timer software as part of the gyms affiliation with FINA. The only timer requirement is that Speed Event timers have a course buzzer that automatically stops a clock. Due to the nature of the Speed Event, we cannot rely on manual stopping of a timer by a course official.