http://wiki.openstreetmap.org/wiki/Marine_Mapping
http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dpier
http://wiki.openstreetmap.org/wiki/Key:mooring
http://wiki.openstreetmap.org/wiki/Harbour#Quay
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RP: i think pier is the accepted method here. it can be used in either way or area mode. see devonport or the viaduct harbour for examples
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HB: nah, a pier sticks out perpendicular to the coast, looking at the data these are mostly along the edge of the coasts ala quays. following the rule of "don't knowingly do the wrong thing" & calling these man_made=wharf.
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uploaded for the mainland 19 jan 2011 in changeset 7010030 (HB)
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HB 21 Aug 2012: reviewed and approved updated dataset for Antarctica; no changes req'd.
HB 5 Sept 2012: uploaded for the Antarctic.