[Tagging] nautical channels

[Graeme Fitzpatrick]

& as I've just mentioned on the Canoe Route thread, we're discussing two
things that are pretty well the same!

https://lists.openstreetmap.org/pipermail/tagging/2018-June/037677.html

https://lists.openstreetmap.org/pipermail/tagging/2018-July/037729.html
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