This is an excellent website if you’d like to track cruise ships.
Using a world map it shows the current location of most of the leading cruise ships.
You can just browse the map clicking on different ships or if you are looking for a particular cruise ship then just enter it’s name in the search box at the top right.
It’s an amazing utility!
Live Ships Map – AIS – Vessel Traffic and Positions will take you to the world map showing the ships.
Just as an example here’s the link to the current location of Cunard’s Queen Mary 2