Any tag whose key is in the form "seamark:...." is from the OpenSeaMap
tagging scheme. Landmarks that bear these tags are features that can be
seen from the sea or river and can be usefully used for navigational
purposes. This is additional information, not duplicate information, so
they may well co-exist with the conventional OSM tags for whatever type
of map feature the object is.
It is true that our tagging scheme is not well documented. This is being
addressed, but as always, this task gets a low priority. In the case of
landmarks, there is some documentation:
http://wiki.openstreetmap.org/wiki/OpenSeaMap/Landmarks
Note that there are some tags with the key "seamark". These are not
OpenSeaMap tags, but belong to another tagging scheme that was proposed
about 3 years ago, but the proposal was abandoned before any voting took
place.
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