foreign_advert is purely self-reported GPS from the node's own
ADVERT. Investigating a real flagged node (RYDBOHOLM, self-reported
as Romania) showed its packets entering the DK mesh through a normal,
healthy 8-hop local FLOOD relay chain (RSSI/SNR consistent with real
short-range LoRa) — and MeshCore has no MQTT-to-RF bridging mechanism,
so that's only physically possible if the node is actually local and
its GPS is simply wrong. Documents the inference rule directly on the
tab: a flag near an actual border may be genuine; a flag claiming
hundreds/thousands of km away, arriving via a healthy local relay
chain, is a GPS data-quality artifact, not real long-distance traffic.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
