[Tagging] waterway=lock_gate - is it only for nodes?

[Malcolm Herring]

On 17/03/2015 13:19, Martin Koppenhoefer wrote:
> their tagging scheme is somehow a parallel universe,

Not parallel, but in some cases complimentary. For 95% of objects there 
are no overlaps with standard OSM objects. It is those 5% of cases that 
do overlap that people notice & hence assume that OpenSeaMap have an 
alternative set of tags for everything.

We always recommend that all natural and cultural features are tagged as 
per OSM Wiki & only add Seamark tags where there is a non-coincident 
definition and the nautical definition is of special navigational 
importance.

Locks & their gates do not fall into that category & so we do not 
recommend using Seamark tags for these objects. Where you may find them 
is probably where data has been imported from S57 ENC charts & the 
importer has not re-tagged (or double tagged) them.

Our renderer does understand both types of tags, although I cannot speak 
for the authors of other SeaMap consumer apps.