Jocelyn, at the age of 15 on 5 September 1981, became the youngest person to swim Lake Ontario in a very fast 15:55 hours. Her coaches were Joan and Cliff Lumsdon. She was a Granite Club competitive swimmer and did a lot of her training at AK-O-MAK open water camp.
In 1982, she won the women's Atlantic City race. The following year she came in third.
She swam 16 km from Sandy Cove to Kitsilano Beach in Vancouver in 1982. She also swam from Canada Place to Expo under the Lion's Gate Bridge in Vancouver to raise money for Cystic Fibrosis.
Jocelyn is perhaps best known for "swimming around" Lake Ontario. Between July 1 and August 29, swimming 7 hours a day, 6 days a week, she swam the 965 kilometer circumference of Lake Ontario. Part of her route was down the Erie Canal, where she was the first person to swim the Tonawanda to Oswego section. She raised $250,000 for Multiple Sclerosis.
She was inducted into the Ontario Aquatic Hall of Fame in 2001 as an athlete.