Apple watch
I want to be able to locate my wife's Apple watch even if she doesn't have her iPhone with her. Can I set up Find My Friends to do that?
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Yes.
https://support.apple.com/kb/ph23048?locale=en_US
If you share your location from an iPhone that’s paired with Apple Watch (GPS + Cellular models), your location is shared from your Apple Watch when you’re out of range of your iPhone and Apple Watch is on your wrist.