Strange tag marine=N?

Just doing some playing on TI while preparing a proposal & found three, apparently related, but undocumented & very strange (to me at least!) tags, used several thousand times:
marine=N: overpass turbo
marine=Y: overpass turbo
MARINE=N: overpass turbo

Some examples:

All of them seem to be tagged in similar ways.

Anybody have any idea of what they are?

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