I tried to get the map that you had and I didn’t know how to do it, so then I tried some research online but couldn’t find anything ... yet. It’s interesting though. I’d like to know more about it.
Scroll down and click on "View Interactive map"
A menu appears to the right of the map. Scroll down to "Charts, Surveys, Ships"
Click on the little plus sign in front of "Charts, Surveys, Ships"
That expands the menu and you will see two selections. Check "AIS Response Vessel Snapshot" and the ships will appear on the map. Zoom in and out to look for ships. Ship names only appear when zoomed in close but you will see the vessels.
Its easier to do than describe...sorta addictive too...watching the ships cluster here and there. If the "Pope Benedict XVI" does not appear, it is because an area is too full of vessels and only some labels are displayed. Wait awhile and try again.