> > On 18/07/2016 08:53, Martin Koppenhoefer wrote: > >> why "seamark:*"? >> > > This is historical. At the beginning of nautical navigation mapping, it > was buoys, beacons, lights, etc that were being mapped.
In effect, it can be seen as "features that should appear on a nautical map". A seamap rendered output will emphasize, or mostly use, seamark features. The convention for seamark is to dual tag when the feature has both a seamark and a mainline osm tag.
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