<p>iD uses <a href="https://github.com/osmlab/editor-layer-index/blob/c7e57a63c6988fae7567af7f581675eb5c06757c/sources/world/OpenStreetMap-GPS.json">this from editor-layer-index</a></p>

<p><code>"url": "http://{switch:a,b,c}.gps-tile.openstreetmap.org/lines/{zoom}/{x}/{y}.png",</code></p>

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