Marbles Mini Glow-in-Dark Compass Survival Button Compass

The Marbles Mini Compass is a 20mm button compass with a magnified face and glow-in-the-dark fluorescent markings.

The magnified face is what makes a dial this small usable. Twenty millimeters is under an inch, and without magnification the graduations are too close together to read a bearing from. Glow markings mean it still works at night after being charged by daylight or a torch, without needing a light held on it.

A button compass is a backup rather than a primary instrument, meant for confirming a general direction rather than walking a precise bearing. At this size it goes in a survival tin, a watch strap or a pack lid and gets carried, which is the whole argument for one. Explore more navigation compasses.

• 20mm button compass with a magnified face
• Magnification makes a tiny dial readable
• Glow markings work after dark
• Small enough to live in a survival tin