Split time is captured based on start, turn, and end swim characteristics. The start of a swim is when the swimmer's feet leaves the wall (for a push start) or when they start movement up and forward (for a dive start). During a turn, the end of a split is captured when the swimmer hits the wall (when their hands hit in open or crossover/bucket turns, and when their feet hit on flip turns). The end of a swim is captured when a swimmer hits the wall with their hand and stops swimming.
Note: For greatest accuracy, the swimmer needs to end hard (head down, touch, stop) and return to vertical head position right away.