Swimmers arms are marked on their forearms during Check-In with their Event, Heat, and Lane Numbers. They are also marked with the first three letters of their last name on their upper arm. These marks correspond to the Heat Sheets. This helps the Swimmers, Kid Wranglers, Ready Benches, Coaches, and Timers keep things organized and helps ensure times are accurately scored if there is a lane error. Marker can be removed from skin with rubbing alcohol or hand sanitizer gel/wipes or sunscreen spray. An example of the arm grid format is shown below. A simplified grid may only use Event and Heat, as the Ready Bench volunteers will place swimmers into the correct lanes, if needed.