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Description

Introducing CrowdMag's newest feature: Flight Mode, which lets you contribute to scientific research by measuring the magnetic field as you fly around the world. To get started, simply provide your itinerary on the CrowdMag app, and you'll be able to turn your flight into a scientific expedition. Check out this step-by-step tutorial for measuring data while flying: https://geomag.colorado.edu/crowdmag-flight-mode-tutorial .

CrowdMag is an app that lets you measure the local magnetic field using your smartphone. You can view the data as a graph or a map in nanotesla units. CrowdMag measures the Z (downward component), H (horizontal intensity), and F (total intensity) magnetic field components. You can use CrowdMag for measuring magnetic data during outdoor activities, while flying, or to conduct your own experiments. You can also share it with NOAA to help scientists better understand Earth's magnetic field.

If you're going for a walk, run, or other outdoor activities, you can use CrowdMag to measure the magnetic data along your path and save it as a "magtivity." And, if you get a new phone, don't worry! You can export a backup of your CrowdMag data and save it on your computer. This way, if you have to reset your phone or switch to a new one, you can import your backup and continue using CrowdMag without losing your data or progress.

CrowdMag also has a magnetic calculator that provides magvar (declination), the magnetic field's dip angle, total magnetic field, and other magnetic field components based on the latest World Magnetic Model (WMM2020). Some of the other features of CrowdMag include creating your own magtivities, customizing recording frequency and location accuracy, exporting your data via email or Google Drive, and seeing generalized crowdsourced magnetic data from other users.

And, before we forget, CrowdMag also features a compass that distinctly shows both true and magnetic north. As an added feature, the compass also has a 3D display with an optional audio output - check it out!

CrowdMag features:

* Create your own magnetic activity (called a "magtivity")
* Measure data while flying
* Customize recording frequency and location accuracy to your preferences
* View your magnetic data on an interactive Google Map
* Graph your data as a time series line chart
* Check the quality of your data by comparing it with the World Magnetic Model (WMM)
* Export your data as a CSV file
* Clear stored data on your phone when you want to start fresh
* Choose to share your data with NOAA (optional)
* See generalized crowdsourced magnetic data from other users
* Use the live magnetic compass for 2D and 3D rendering
* View information about the current solar magnetic disturbance
* Use the most up-to-date magnetic field model (WMM2020)
* Export your data via email, Google Drive, or other options
* Export a CrowdMag backup to save your contributions' status and data
* Import your CrowdMag backup (works across different phone platforms)


Visit https://geomag.colorado.edu/crowdmag to see crowdsourced magnetic data.

Developer

University of Colorado Boulder

Developer ID: University of Colorado Boulder

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Recent Reviews

Mark Fleckenstein

v2.2.6

it can find anomalies everywhere. Now that I think about it, this is Pittsburgh!! We have railroads, pipelines, old coal mines, slag dumps, giant steel buildings from the 40s 50s 60s, MRIs, high voltage lines, paved over trolley tracks and cobblestone. Rivers and bridges (you can not drive two miles without crossing one or two) plus a nuclear facility. So I wonder about the quality of my data.

Developer Response

Glad you are finding the app useful.

27 Apr 2026

3 Jun 2026

George

v2.2.3

i like what i see. ive had it 5 minutes on Samsung A24.

Developer Response

Glad you like it! :)

1 Dec 2025

22 Nov 2025

Dirt Track Dave

v2.2.1

Decent, have crash issues of it crashing after recording mag data 50% of the time.

Developer Response

We are sorry to hear you are having crash issues.

20 Oct 2025

18 Oct 2025

Stanley Moras

v2.2.3

the app doesn't seem to want to run in the background on a P10PXL. Allow all the time was enabled. Thank you for your help and being here.

Developer Response

Thank you for the five star review, we run into issues on different android devices that we can't account for all.

6 Oct 2025

30 Sept 2025

Alf Onico

v2.2.3

Samsung Galaxy S5 Lineage 18.1 Android 11 CrowdMag version 2.2.3 working perfectly OK. Thanks to the developpers.

Developer Response

Thank you very much for your 5-star review!!!

23 Sept 2025

9 Sept 2025

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