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Outdoor use

Hello, I am developing an app in unity for outdoor use. The problem I have is the orientation of the AR camera. If we have as a reference a map of any city in the world and I calibrate the orientation of the camera correctly initially, when I start to move it seems to work fine, but after a while the orientation starts to fail and the camera drifts, causing the location on the map is not correct. Then I recalibrate the AR camera using the Reset and RecenterPose methods, again giving the orientation I want. Would this use of AR be correct for outdoors? the orientation is easily lost, would there be a way to calibrate the AR camera so that it does not lose orientation so quickly? Thank you very much. The english is google translate.