Checkpoint - Stand with SI unit.

Most checkpoints will have a electronic punch unit, a so called SportIdent unit, or SI unit. Teams will punch by putting their SI card through the SI unit. The SI unit will make both a visual (red blink) and audio (beep) confirmation that the team's SI card have been registered. Teams that lose their SI card will not receive a finish time, and will need to pay $35 for a replacement. More information about the electronic punching will be e-mailed to the team captains closer to race day.