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Open Source FindMyDevice Solution - selfhostable!
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GPS on a secure device is the answer. Also read my long explanation. I recommend using 2 devices and identities to avoid similar issues
Assuming by secure device you mean one with a removable battery or no cellular modem at all.
That's really overkill for my threat model. For me it's a device with a degoogled FOSS ROM, no proprietary software, no sim card and with correct settings