These are warning beacons to mark the line of reefs. The appropriate
OpenSeaMap tagging would be:
seamark:type=beacon_special_purpose
seamark:beacon_special_purpose:category=artificial_reef
seamark:special_purpose_beacon:shape=pile
seamark:light:colour=<whatever the colour of the light is>
seamark:light:character=<whatever the flashing pattern is>
seamark:topmark:shape=<if it has a topmark, the shape>
seamark:topmark:colour=<if it has a topmark, the colour>
NB: these tags will only be rendered on OpenSeaMap (an overlay to the
StreetMap).
man_made=beacon would be appropriate for the StreetMap, although I don't
know whether this tag is rendered.
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