A Main Sheet Traveler helps to control the amount of heeling of your boat while underway. A Traveler Control Kit makes adjusting the Traveler easy. The concept is simple. You move the Mainsheet Traveler Car to the same side of the boat as the boom. This forces the boom to lift on the side of the boat that has a tendency to drop or heel as the wind blows.
This view show how the control lines are set.
Pictured above are the Main Sheet Traveler and a Traveler Control Kit. Both can be pruchased from Catalina Direct.