Hi,
I still got the message today on Chrome and tried using adblock to get rid of it. I answered some questions and closed Chrome. I opened it after a while and when I opened Shipspotting's home page the windows showed up briefly then closed without my interaction. The situation was repeated at almost every change of pages on the site so I decided to continue my visit on Edge, another navigator.
I checked in Chrome's options and shipspotting.sendpulse was on the blocked list.
However, still no problem with Microsoft Edge, so far at least.