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Linked accounts can place 2D markers on the map (y auto-derived from the chunk store's heightmap); anonymous visitors keep a localStorage-only list via the same height lookup. Sharing a marker forwards a structured payload to the mod over its WS connection, which builds the actual chat text (see MCMapper-Mod for the JourneyMap/Xaero formatting). Built test-first per the project's TDD workflow. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015tKdPZt78zbPUZMXWzKEKt