Professional Mirror Compass. The advanced navigation compass. When venturing out into unknown territory, these sighting compasses offer precision navigation with a variety of carefully engineered and dependable features for challenging conditions. Sighting tools for accurate direction. Rugged construction.High grade steel needle with jewel bearingBalanced for northern hemisphereAdjustable declination correctionLiquid filled capsule for stable operationMirror for sighting bearings and signalingSighting hole and notch for accurate bearingsNon-luminescent bezelN/A