The most important rules

The objective of the race is:
a)  to determine the team that has flown the greatest distance, measured in a straight line from the start
b)  to promote the sport of gas ballooning and the technical development of gas balloons by comparing performance
c)  to promote good relations between countries and their pilots
Definition of “winners“  
  The winner is the team that has achieved the furthest distance from the start
  (neither the actual distance flown nor the time taken will be taken into account.)
  The national Aero Club of the winning team wins the right to stage the next-but-one competition
Conditions of entry
  The race is open to all nations that are members of the FAA
  Each nation may select and enter a maximum of 3 teams, each consisting of a pilot and a co-pilot.
  Both pilot and co-pilot must be nationals of the country entering their team, or must have been resident in that country for at least 5 years
  Both pilot and co-pilot must possess valid balloon pilot and sporting licences
  The pilot must possess a valid gas balloon pilots license including a night rating and be able to prove a minimum of 50 hours experience
Definition of a competition balloon
  A gas balloon is an aircraft that is lighter than air, with no means of propulsion. Its lift is derived solely from the weight difference between the environment and the lifting gas
  The maximum volume is 1’000 cubic meters, with a tolerance of 5%
  The national flag of the pilot must be flown by every balloon
  Only finely-divided sand or water may be used as ballast