The SOL Sighting Compass allows you to take precise navigational readings while keeping your eye on the trail in front of you. For improved accuracy, adjust the declination with the included tool. With inch, millimeter, and ratio measurements on one tool, you can get accurate readings on any map. Use the magnifying glass to identify key waypoints and the glow-in-the-dark features for twilight navigation. Align your adventure with the index lines and orientation lines. Keep around your neck or attach to gear with the included breakaway lanyard. Intended for us int he northern hemisphere only.