More thoughts on Garmin privacy - You can use whichever device you have in an offline capacity, and manually take the .fit / .tcx /.whatever files off the device, and anlyse them on your local machine using something like Golden Cheetah.
This is what I've done for years, using WKO3. I never enable WIFI or BT on it. Less about security and more about battery life.
@hippy started
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More thoughts on Garmin privacy - You can use whichever device you have in an offline capacity, and manually take the .fit / .tcx /.whatever files off the device, and anlyse them on your local machine using something like Golden Cheetah.