Aluminum Aviator's Pocket Compass This Aluminum Aviator's Compass is precision crafted from aluminum, and is extremely lightweight and durable. The quality liquid-damped compass card is marked "Stanley London" and similar to cards found in more expensive lensatic compasses. The four bright glow-in-the-dark luminescent arrows are unique and invaluable for nighttime readings. The luminescent arrow indicating North allows fast and reliable orienting. The Aluminum Aviator's Pocket Compass measures 1 15/16 inches (49 mm) in diameter, 1/2 inch (13 mm) thick, and weighs 1.1 ounces (31.8 grams). The precision liquid damped card is 1 9/16 inches (40 mm) in diameter.