This small compass conveniently mounts to your web, plastic or leather watch band. A sapphire bearing and a capsule designed to work on inclines gives you incredible accuracy and better performance. A luminous dial is marked with a red arrow at the north point. And S, E, W points are marked by letters while the intercardinal points are marked with long lines at the 90° positions. For even more accurate calculations, the rotating bezel has 10° gradations and locking teeth.