Survival tools

Offline compass

Hold your phone flat, with the top edge pointing ahead. Browser compass readings require portrait orientation. Keep away from magnets, vehicles and metal objects.

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Compass is stopped. Start to check your phone’s sensors.

The web compass uses your browser’s north reference. On iPhone it uses magnetic north. True north can differ; use the map’s local magnetic declination. Android’s native compass includes an optional declination adjustment. If readings jump, move away from interference and calibrate as your phone manufacturer recommends.

Directions without a sensor

Learn the cardinal directions, use a map and physical compass, find North with Polaris, and understand what the Sun can tell you.

Prepare before going offline

Save this compass and its guide while online. Then reopen this page in the same browser when offline. Test before your trip. Android’s native compass and guide are bundled with the app.

Offline saving has not been checked.

Browser storage can be cleared or evicted. Keep a physical map and compass as a backup.

Useful additions to your survival kit

• Offline maps with downloaded terrain, saved waypoints and a return route.
• A trip plan shared with a trusted contact before departure.
• An offline first-aid reference and a whistle or signal mirror.
• A headlamp, spare power and a battery-saving plan.

These are preparation suggestions; offline maps and first-aid modules are not yet included here. See the National Park Service’s Ten Essentials.