Drag silhouette to move · Drag to rotate Click 2 points on snapped route → shortcut "Add waypoint" → click route to re-route through point
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Safari blocks routing from file://

Safari refuses cross-origin fetch from local files. Two easy fixes:

1 · Use Chrome or Firefox. Right-click the HTML → Open With → Chrome or Firefox.

2 · Serve via local web server. In Terminal:

cd "$(dirname "$(mdfind -name gps-art-studio.html | head -1)")" && python3 -m http.server 8765 & sleep 1 && open "http://localhost:8765/gps-art-studio.html"

Or double-click launch-server.command in the same folder.