Thank you for the reply, I may not have worded my question very well at the time, I should have waited until I had more time.
We are using Find My network for a large number of devices and items, also for family location sharing between family on their own accounts and in this specific case, family with shared apple services (listed family member). The functionality is familiar (too familiar, sometimes, because of numerous unsolved apple ID errors over the years ending up in engineering every time).
The location of each device is accurate, and this is where my question is. When the iPhone as the primary device of my partner for sharing location is idle at home for over an hour, the location of the cellular Watch 6 she is wearing on her bike, with full coverage, updating on the network under devices, should become the default location of the account owner; the settings are to share the user (signed in ID) from the phone, and cellular watch(s).
The error, in my mind, is that her location under People, despite constant movement for an hour plus of the watch on LTE, disconnected from the phone which at home on Wi-Fi (the known home location), is showing "live" where the phone is, at home. The idle device on the home Wi-Fi. Then every now and then shooting over to where the watch is, for about one second, before snapping back to the phone at home.
The watch is updating as a device, the phone knows it is at home, unmoving and untouched, so why does her location not remain with the watch as the location of the user ID?
This is my concern. It is not critically bad, but it is not operating as it is supposed to - unless it is known that frequent movement of the watch, with total LTE and GPS coverage, is too much and the service does not accommodate it, only working when people are mostly not moving. But the Watch Ultra would imply this is very much supposed to function as I am assuming it to.
I hope that was not too long-winded, but I do wish to explain my question better here.
More input very welcome, thanks!