NDuR 51590 Waterproof Button Navigation Compass

The NDuR Button Compass is a liquid-filled 0.75 inch compass weighing 0.05 ounces, about the diameter of a US penny.

Liquid filling is what makes a compass this small usable. The fluid damps the needle so it settles in a second or two instead of swinging back and forth, which on a dial under an inch across would otherwise be unreadable. It is a general-direction instrument rather than a precision one, meant for confirming which way is north rather than walking a bearing.

At 0.05 ounces it disappears into a survival tin, a watch strap or a pack lid, which is the point of a button compass. The one you carry beats the one at home. It is GSA and TAA compliant, which matters for government and military purchasing. Explore more navigation compasses.

• 0.75 inch, about the size of a US penny
• Liquid filled so the needle settles fast
• 0.05 ounces, fits a survival tin or watch strap
• GSA and TAA compliant