Running (Trail) 33:57 [2] 5.0 km (6:47 / km) +63m 6:23 / km
shoes: Salomon Sense Pro - Blue
Test run with my pretty new Ambit in a custom-configured Ultrarunning mode, i.e. reduced recording rate for longer battery life. The GPS track demonstrates the compromises of this mode. Distance recorded is shorter than it really was because the watch doesn't know about all the bends in the trail. I'll guess 5 km but the watch measured 4.37 km.
At UTMB last year, the numbers I looked at most of the time were Altitude and Time of Day. Distance was much less meaningful to me than the amount of climb remaining to the pass so I can live with the reduced distance accuracy in exchange for battery life. Time of Day is important to me because I'm so close to the cut-offs.