Adjustable Declination - True North and Magnetic North are not identical. The Sun Company ProSight Base Plate Map Compass has an adjustable declination dial for the most precise direction reading. Luminous Rotating Bezel - Compass bezel rotates 360 degrees for easy bearings. Dial is ultra-luminous which makes this one of the premier navigational compasses for low-light situations. Sighting Mirror & Protective Cover - Cover keeps the compass safe from damage. Open up the folding cover to reveal a full-sized sighting mirror. Great for military, surveying, bushcraft, and scouting applications. Clinometer - Includes a clinometer in the dial for measuring the height of any landmark. Full instructions are included for help with setting declination, taking bearings, and measuring target heights. A great learning tool for kids! More Features - Other features include a jewel bearing, 3X magnifying glass, 4 map scales, inch and mm rulers, a break-away safety lanyard, and silicone anti-slip foot pads. The perfect map compass for any survivalist, boy scout, adult, or kid! True North and Magnetic North are not identical. The Sun Company ProSight Sighting Map Compass has an adjustable declination dial that makes it easy to get the most precise reading from your compass. Compass bezel rotates 360 degrees for easy bearings and the dial is ultra-luminous, making it the perfect compass for low-light situations. The protective cover keeps the compass safe from damage. Open up the cover to reveal a full-sized sighting mirror. Includes a clinometer in the dial for measuring the height of any landmark. Full instructions are included for help with setting declination, taking bearings, and measuring target heights. Other features include a jewel bearing, 3X magnifying glass, 4 map scales, inch and mm rulers, a break-away safety lanyard, and silicone anti-slip foot pads.