Rickmansworth and Watford Sea Cadets volunteer Nina Guppy won the Most Flexible Volunteer Award at an inaugural prize-giving.
To mark its first anniversary, #TeamHerts Volunteering held an awards celebration to recognise and reward the achievements of volunteers and charities across the county.
Nina was selected by the judges for giving her time to her unit as an events assistant. She is also training to qualify as an instructor in paddlesport, sailing and expedition leadership.
The Chairman of Rickmansworth and Watford Sea Cadets, Fabian Hiscock, who put Nina forward for the award, said: "Her extraordinary flexibility and willingness to take on new challenges has provided an astonishing demonstration of selfless and highly effective volunteering, and has had a major influence over the working of our Sea Cadets unit."
The award coincides with Volunteers' Week, which runs until 7 June. Sea Cadets is marking the event to recognise its 9,000 volunteers.