Hi Richardson, 

If the boat was in the location you've shown, I'd hope it's a high tide and a Boxing Day Dip, otherwise the DLO might ask questions! :-)

OSM notes are public comments intended to improve the map. If you want your own map with markers on, there are several options:
* use the 'Share' button on the right to get a link to a single marker
* use the 'Share' button to export a map as an image and edit
* or alternatively take a look at umap:
http://umap.openstreetmap.fr/en/

There's also https://map.openseamap.org/ which I've personally added the local lights and marks as well as GPSr survey of the bay itself. You'll also notice the Institution boathouse, shop and the Rocket House are also included.
TTFN,

James