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Typically, one uses a compass with mirror for truer azimuth reading over distances while orienteering with a compass. It aids in capturing the definitive azimuth if sighting to peaks far off in the distance. Only ‘you’, know what type of accuracy you’re seeking. I personally opt for lighter, less costly model without a mirror when hiking trails in parks and using maps moderately.  I go to mirrored model when that map and compass are my sole navigational materials by which to designate a path through wilderness areas less traveled or the trail isn’t well marked. Hope that helps a bit! Safe Travels! {Jim E. from REI Northbrook, IL}