In glorious sunshine, riders had to negotiate their way around an orienteering-based course designed to test them and their Garmin Oregon units to the limit.
They had to collect up to eight stamps across a tasty mix of twisting climbs, forest track and fast rocky descents, with added points for speed.
Natasha Litherland, from Milland, got round the 7.3-mile course in just over 49 minutes despite being tired from racing the day before, and managed to beat second-placed James Lakeman by just a few points.
It means she wins a Commencal Super 4.1 bike, a Garmin GPS unit of her choice and a place on the Garmin MTB Academy alongside previous winners Matt, Adrian and Grant, where she'll get to improve her skills with the legend that is Steve Peat.
Want to know more? Head over to BikeRadar.com/Garmin for details of the competition.