Thousands cheered as 17-year-old Mike Perham arrived Saturday in Portsmouth.
A Guinness World Records representative has certified Perham is now the youngest person to sail around the world with some assistance. He was 16 when he set off in Novemeber and turned 17 in March.
Perham tried to complete the challenge non-stop in his 50-foot racing yacht called Totallymoney.com but technical problems forced him to be assisted.
Meanwhile, a Dutch court has ordered a 13-year-old girl who plans the same trip be given a psychological assessment to determine her ability to deal with two years of isolation.