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AR alignment check

Use the preview to center the selected target on the reticle. Gently move the phone to refresh its direction, then align and capture.

Camera is off.

Location is off.

Motion sensor is off.

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This measures alignment; it does not calibrate your phone or apply a correction. Compass accuracy may be unknown. GPS must be less than 30 seconds old and accurate to 100 m or better; motion readings expire after 3 seconds.

Recent measurements

Differences are measured minus expected. Camera images stay on your device and are never saved. Measurements are held only in this page’s memory until you copy, download, or explicitly send a report.

Share an alignment report

Send shares up to ten measurements, UTC times, raw sensor readings, expected and measured directions, errors, accuracy, phone/browser descriptions, and app build details with the Once Around maintainer. No camera images are sent. Coordinates are optional; times and sky directions can still reveal an approximate location. Reports are private and deleted after 90 days during daily cleanup.