You're not stupid at all, this is one of the most common questions we get about military vessels, and it's a totally fair point.
The last position shown on our site (or any AIS-based tracker) is simply the most recent time the ship's Automatic Identification System (AIS) transmitted a signal. AIS is the global maritime "GPS broadcast" system that gives exact lat/long, speed, course, destination, etc. For commercial ships it's required 24/7, but government and military vessels are not required to transmit it at all. In fact, for operational security (OPSEC) reasons, U.S. Navy ships like the USS Tripoli routinely turn their AIS off, especially when deployed or in a conflict zone. That's why the last public ping on our site is from years ago in San Diego (her old homeport before she forward-deployed to Sasebo, Japan in 2025). Forward deployments like this usually result in an AIS black out condition for the ship.
Google isn't using AIS tracking at all. It simply scans news articles, social-media sightings, local media reports, and official releases, then pieces together an estimate of where the ship "might" be. That's why you see more recent info there, especially right now while the USS Tripoli ARG is in the news heading to the Middle East. Those stories give a general picture that's useful for broad awareness, but they aren't precise position data like AIS provides when a ship is actually broadcasting.
Cruising Earth sticks to verified, real-time AIS for accuracy and consistency across thousands of vessels. Google is great for headlines and estimates, especially on high-profile military movements. Both have their place, and outside of war-time conditions Googles information would usually be much less accurate.