SAR Staff and the SVU staged at the Jumbo Grade OHV parking area to search for a subject that was pinned underneath his ATV. Due to poor cell reception, coordinates were not accurate. Fortunately, RAVEN was airborne already and was able to locate the site just as SVU assets were leaving staging. Once teams arrived, the subject was extricated from underneath the ATV and a Hasty Team medic conducted a medical evaluation. The subject was transported back to staging.