The Suunto MCA-D Challenger Compass features a fixed declination scale and high-quality mirror. The MCA-D Challenger is ideal for surveyors, rescue patrols, and any hiker who appreciates accurate, reliable measurements. The mirror lid locks open at various angles (60 degrees, 120 degrees, and 180 degrees) and remains securely shut when the lid is closed. A sighting notch provides optimal accuracy.