With which sport is the 'Choudhury Trophy' associated?

Circumnavigating of the earth by car. This trophy has been named after Saloo and Neena Choudhury, ace car rallyists from Calcutta. It's in recognition of the couple's achievement in 1989 when they passed through all six continents in 69 days and repeated the same feat in 1991 in 39 days.