Cairn GPS is a free, private outdoor navigation app for hikers, backpackers, and backcountry travelers — with offline maps, route planning, GPX tools, weather, wildfire data, and no accounts, ads, tracking, or subscriptions.

Contributions help support continued development, research, and experimentation: better maps, smarter planning tools, improved offline features, richer outdoor data, and a more dependable experience on the trail.

If Cairn has helped you explore, plan a route, or feel more confident outside, your support helps push the app further.

Thank you for supporting independent outdoor mapping.