http://wiki.openstreetmap.org/wiki/Tag:waterway%3Ddock
http://wiki.openstreetmap.org/wiki/Tag:dock%3Ddrydock
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Note this covers both floating and dry dock polygons, but only a single drydock is present.
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HB: looks good to me.
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uploaded by HB for the mainland 18 Dec 2010 in changeset 6690950
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HB 22 Aug 2012: updated to new field names.