[1] Humphreys has competed in three round the world races (Whitbread Round the World Race 1993–94 and the BT Global Challenge 2000–2001) and (Vendee Globe 2004–05) He has also competed in the Transat (2004), the Route du Rhum (2002, 2014), the Transat Jacques Vabre (2003), the Archipelago Raid (2008–2011) the Extreme Sailing Series (2005–2007) and La Solitaire du Figaro (2011).
While at Plymouth University, Humphreys skipped the college sailing team to winning the BUSA Student Yachting Nationals and finishing 2nd at World Championships.
In 2001, Humphreys teamed up with Mike Golding as navigator for the EDS Atlantic Challenge, competing two transatlantic crossings and finishing 3rd in the inaugural edition of the race.
In 2003, Humphreys secured sponsorship with Motorola for the Transat Jacques Vabre and raced double-handed with Australian speedster Paul Larsen.
In 2011, Humphreys again teamed up with sponsor, DMS for the La Solitaire du Figaro, the unofficial World Championships for single-handed sailing.
Humphreys sailed under the banner of the Artemis Academy which was set up by OC Sport to support talented solo sailors.
After a break from solo sailing, Humphreys returned to race in the 2014 edition of the Route du Rhum with the Class 40, sponsored by Cat Phones and Bullitt Group.
In 2016, Humphreys was recruited to be the professional skipper on board the ambitious recreation of Captain Bligh's 4000 mile voyage in an open 23 foot boat from Tonga to Timor for Channel 4.
Using traditional navigation equipment and surviving off the same meagre rations as Bligh, a team of nine men led by former SBS trooper Anthony Middleton were cast adrift to recreate one of the world's greatest open boat voyages of British history.