The event is organised by the British Army and is mainly attended by teenagers aged 14 to 19 from schools, colleges, scout groups and army cadets, although entrants have been limited this year from the South West due to increasing numbers interested in undertaking the challenge.
The teams will camp overnight in what could be very wet and windy conditions this weekend and should arrive back at the starting point at 9am tomorrow Sunday 12th May. .
Almost 300 youngsters with special physical or educational needs will also take part in the Jubilee Challenge, completing routes of up to 15 miles (24km).
Troops involved in the event include members of the Army, the Territorial Army and the Royal Navy.