This spell provides the target with the Track feat for the duration of the spell. If the target already has the feat, then a +10 bonus is provided to all Survival checks made to track. The feat or bonus only applies within a desert region. If the target leaves the desert, these benefits are lost until returning to the desert sands.
In most cases, tracking in the desert uses the soft ground DC of 10. Sandstorms reduce visibility and give a DC modifier of +5. Following a trail after sand has blown over it has a DC modifier of +10. The spell can also help track creatures that are subject to the pass without trace spell. The DC to track these creatures is 25 and normal tracking modifiers apply.