Sensor test

For checking the compass and tilt maths on real phones. Nothing on this page is sent anywhere: "Copy report" only copies text to your clipboard. Your location is only used on the device, to work out the magnetic declination.

Checks to try

1. Camera method, phone upright: aim at something whose compass bearing you know (a street on a map, the sun's azimuth). Heading should match within about 5-10°.
2. Tilt: phone upright and level → 0°; aim the camera at your feet → about 90° below.
3. Top-edge method, phone flat: heading should match a compass app. Rotate the screen to landscape: the heading should follow the new top edge.
4. iPhone: hold the phone flat once after enabling (it learns north), then raise it upright; the heading should stay steady and correct.

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