crowdmag

[ad602000]

while searching for a decent compass app, I discovered this app which not only sends data to an org that measures magtivity globally, but also provides you with a compass that advises you of local declination and it is free

cheers
Pete

[miketheobscure]

Very cool - installed :)

https://www.ngdc.noaa.gov/geomag/crowdmag.shtml - has info & links to the app stores