<p>Osmand (and probably others) adds <code>?z=20</code> to the url. Seems to be non standard and <a href="https://github.com/MarcusWolschon/osmeditor4android/blob/d0cace31061f20ef38ae6b1b43c06ba7ab2201c8/src/de/blau/android/GeoUrlActivity.java#L33">ignored</a> by Vespucci. But perhaps worth to add.</p>

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