Dear, I think this feature is quite easy to implement in our watches via update and should be a must due security reasons, what about a massive request to Garmin for this feature? Are many people interested? It is only an extension of an existing service "live tracking" of our watches so it does not affect to the segmentation between different watches range that Garmin pretends.
Try to keep alive this topic on the forum for know a Garmin response if they have in mind or not.
Thanks everybody