The new clock is more accurate than before.

"UCLA scientists have successfully excited a thorium-229 nucleus with lasers, paving the way for nuclear clocks with unparalleled accuracy. By developing thin thorium films, they overcame key challenges of scarcity and radioactivity, making this breakthrough practical for real-world applications. Credit: SciTechDaily.com" (ScitechDaily, 

The new, most accurate clock uses thorium-229 isotopes excited lasers. That makes the clock very highly accurate. The highly accurate clocks, used in the GPS. Those systems can make it possible to measure things like gravity waves. The system can also measure things like how energy and speed affect time. 

Gravity fields cause time dilation that the high-accurate clocks can measure. The most interesting thing about those super clocks is that they can used for gravity-based navigation systems. Earth's gravity field is not the same everywhere. The system that measures time dilation can navigate things like submarines and other things that cannot use satellite navigation. 

The problem with inertia is that the system uses the gyroscope-clock combination. The submarine travels at a certain speed in a certain direction. When it gets the time mark, it turns in a certain direction. The problem is in the cases. Where the submarine must change its speed. That thing causes problems with inertia. 

The system is the weight that is on the libra. The gravity field affects the weight weight. Connecting that system with the ultra-high accurate clock makes it possible to use that clock with inertia. The system uses highly accurate clocks as chronometers. 

The system includes acceleration measurement systems, sonars, and other active and passive systems. There is the possibility to use the underwater versions of the TERCOM but there are problems with similarities with underwater structures. The gravity maps help to determine the location of the vessel. 

When the system makes gravity maps. The system searches for differences in the oscillation of the thorium-229. The AI-based system can see how often the Thorirum "crystal" sends a time mark. The system can have two atom clocks on opposite sides of the Earth. The system searches for differences in time marks of those clocks. The system uses three clocks there the third clock synchronizes the system's ability to work. 

https://scitechdaily.com/scientists-just-made-the-most-accurate-clock-even-better/

https://en.wikipedia.org/wiki/TERCOM