Hi, 
Ah - a pattern is emerging suggesting MCA/ HMCG/ Institution/ First responder/ Incident reporter.
OSM might be easier than lat/long to 3 decimals over VHF 0 or 16 without DSC, but map notes are public so not ideal.
Again, I'd suggest the Share button or https://maps.google.com/pluscodes/ . 
Still better than the proprietary mess which is What3Words!

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/