That odd boat again

Ditchcrawler reckons that the funny boat I wrote about a couple of posts back is an estuary buoy.  Thanks Dc. Although I can’t see one like it on a search of google images, it sounds entirely feasible to me.  I imagine it would swing nicely in line with the tide.  That being so, despite it’s shortcomings as a boat to live on, at least it should have a decent anchor.