Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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Viewing shared locations and managing accessContacts who receive a satellite location update can see it in the same way as standard Find My location sharing. The location appears on the map with a timestamp indicating when it was sent. If additional updates are needed, the process must be repeated, provided satellite connectivity is still available.
The fragmented MP4 format is critical here: it lets mp4box.js begin parsing incrementally without needing to seek to the end of the file first. Decoding uses a 10-frame lookahead window to keep latency down without blowing up memory: