You'll see a figure-eight animation. Hold your iPhone in front of you and trace a smooth horizontal figure-eight a few times. The overlay will clear once the magnetometer settles. Move away from metal objects (laptops, cars, fridges) and try near a window if you're indoors.
No. Northsense works fully without location using magnetic heading. Location is only needed if you want true-north scoring (which compensates for magnetic declination — usually a small effect, around 10° in most populated areas).
Apple's iOS Simulator does not provide compass heading data. Use a physical iPhone.
Open Settings → Northsense and make sure Motion & Fitness is allowed. Memory Walk only counts steps that happen after you tap Start.
On your device, in SwiftData. Nothing is sent anywhere. Deleting the app removes everything.
Drop us an email with: iOS version, the round you were on, and a short description of what you did and what happened. Screenshots help.