[Tagging] waterway=fairway?

[Bryce Nesbitt]

>
> 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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