BCP185 - Calgary - Oakridge.
As Peg and I were approaching the cap, our Oregon was pointing about 30 metres into the field on the other side of the fence. After stoppiing at the fence for a few minutes pondering whether the compass calibration had anything to do with that, we noticed that the the arrow was pointing behind us again. After giving some cursory examinations to some other candidate depressions along the direction it was pointing, the cap was found. Snapped a picture, calibrated the compass, and headed back to the geomobile. TFTB!