The magnetic field strength decreases at a square of the distance... unless it's got some ferrous metal touching both the magnet, the mount, and the device to facility conduction. The stronger the field, the farther from the magnet the [thing with electronics in it] should be.
Might I suggest you test the magnet touching something other than your GPS (but similar in guts) that you don't mind bricking before going out and depending on it during a trip. I suspect (but don't know) that the strength of rare earth magnets in close proximity to a GPS might affect it's radio reception (like jamming the signal).
Ridden wet. Put up hard.
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Last edited by bounce; 08-16-2020 at 09:58 AM.