As Strava topic looks to be properly kaput:

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for me question still stands.

Do you need data/reception for Google Location Sharing like for Strava Summit Beacon?

Cheers!
I.

Yes.

If you want location sharing/tracking without a data signal then you need to look at Spot or Inreach.

Looks like Strava topic is back, but that only reconfirms my suspicions.

Thanks scotroutes

Cheers!
I.