Page 6 of the RAD manual states:
"Visual Observer Station The area where only the Visual Observers are permitted during the challenge. For a Race, there are two (2) Visual Observer Station, one (1) for each team."
However, the diagrams on page 3 and page 12 shows two observers for each team positioned on each 51 foot side of the field. I believe the manual should state there are four (4) Visual Observer Stations, two (2) for each team.