Accuracy is limited by:
Typically you can only get a bearing to +/- 5 degrees with a standard silva compass and im not sure its any better with the compass app on a phone. It would be real good to have an app in your phone camera which showed the bearing when you point a reticle at the destination in the picture.
Distance could be a problem if the ground or line of sight is sloping but your map is flat.
A zoomed in photo of where the deer was can be helpfull if you mark on the pic before leaving your firing point.
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