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.


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