Stanley London Luminescent Hiking Compass The North end of the compass needle has a luminescent dot that glows in the dark for easy nighttime reading. The Hiking Compass is made of solid brass which will not rust. The compass measures 1 13/16 inches (4.6 cm) in diameter and is 0.46 inch (12 mm) thick. This Hiking Compass weighs only 0.86 ounces (24 grams).