CrowdMag is a citizen science project that uses your mobile phone. Created by the National Centers for Environmental Information, the CrowdMag app uses your phone's internal magnetometer to record magnetic fields as you move around outside. You can explore the data you collect and see if you can match up magnetic anomalies with objects in your environment. Learn more about Earth's magnetic fields from the NOAA Geomagnetism group.
CrowdMag now has a flight mode for use on airplanes! Check out our other tiny tutorial to learn more.
Below, you can go through each step at your own pace.