While this sextant has been used to navigate both the Atlantic and Pacific oceans, its primary application is as a great tool for students to use before buying a more expensive sextant. It has a 7" arc and four sun shades. Plastic construction is corrosion-proof and instantly adjustable. Case not included. Frame Material: Plastic construction Sighting System: Half-silvered mirror Scope Magnification: None Filter Shields: Four sun shields Arc Range: 2' of arc Drum Calibration: 120° to -5° of arc Lighting: None Weight: 6oz. Case: Not included Included Accessories: Instruction booklet Warranty: One Year