The Worlds Best Compass incorporates everything Brunton has learned while making professional precision instruments since 1894. Its Rare-Earth Ever-North magnet, sapphire jewel bearing and magnetic declination adjustment ensure the compass is accurate to +/- 1/2 degree. Featuring precision aligned mirrors for see-through sighting plus short and long sights for increased accuracy, Brunton's WBC is adventure-ready for todays most demanding outdoor adventurer. Going global? WBC owners receive lifetime precision declination adjustments by Brunton's master technicians when traveling in the Southern Hemisphere.