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Will magnet disable GPS tracker?

I think GPS lets satellites/carriers know where you are - so turning off GPS is a good thing for privacy.

Answers

no. GPS satellites are thousands of kilometers away from you in Earth orbit and are not affected by any magnets on your body.
However, various types of cheap GPS jammers can be purchased online, such as physical shielding, Wi Fi/Bluetooth jammers, remote control jammers, spy camera jammers and UAV jammers, to name just a few.